Downgrade iPhone 3GS / 3G 06.15.00 Baseband To 05.13.04 Baseband to Unlock, Fix GPS

How to Downgrade iPhone 3GS / 3G 06.15.00 Baseband To 05.13.04 Baseband to Unlock and Fix GPS

MuscleNerd has finally released RedSn0w 0.9.14b1 to downgrade iPhone 3GS / 3G 06.15.00 baseband to 05.13.04 baseband which can be unlocked with UltraSn0w and also fixes the GPS, stock firmware issues incurred on iPhone 3GS/3G due to iPad baseband 06.15.00.

In this guide you’ll learn how to downgrade iPhone 3GS / 3G 06.15.00 to 05.13.04 baseband using RedSn0w 0.9.14b1.


  • This downgrade method applied to iDevices compatible with iPad baseband 06.15.00 i.e.: iPhone 3GS and iPhone 3G only.
  • This baseband downgrade method does not apply to iPhone 4, iPhone 4S.
  • For those who are wondering if you can update your 3G or 3GS to 06.15 solely for the purposes of downgrading to 05.13.04 and then unlock with UltraSn0w, the answer is “yes” for 3G owners, and “maybe” for 3GS owners.
  • you can now downgrade specifically from 06.15 to 05.13.04 (even if you never had 05.13.04 on that device before).
  • If you have an iPhone3GS and if digits 3-5 of its Serial Number are 134 or later (xx134…), means you’ve an iPhone 3GS New Bootrom then you should NOT try to install the 06.15 baseband on your 3GS! It will brick your radio, preventing both the downgrade from working and normal iPhone software from using it as a phone! Be warned!
  • asdasd

Let’s downgrade iPhone 3GS / 3G baseband 06.15.00 to baseband 05.13.04 to fix GPS and unlock with UltraSn0w…

How to Downgrade iPhone 3GS / 3G 06.15.00 To 05.13.04 Baseband

We assume that you’ve read the important part above and have backed up your personal data using iTunes.

Step 1

Download RedSn0w and the firmware that your iPhone 3GS or iPhone 3G is currently running:

Step 2

Extract the RedSn0w zip file or mount the image if you’re in Mac OS;
Now launch the RedSn0w (Windows 7/Vista users: right-click on RedSn0w > Run as Administrator);

Click Jailbreak button. RedSn0w will now prepare the jailbreak data;
Now check mark the Downgrade from iPad baseband checkbox, RedSn0w will present you with a warning read it carefully and click Yes. Disable Cydia (if you already have it installed), and click Next;

Plug your iPhone 3GS or 3G to your computer and make sure it’s OFF. Do a controlled shutdown of your iPhone (“slide to power off”).  This step is very important to avoid mount problems when the ramdisk is running! Now click Next.

Now RedSn0w will guide you through the steps to put your iPhone into DFU mode. Follow the on-screen instruction to put your iPhone into DFU mode.

  • Release the Power (corner) button for 3 seconds
  • Without releasing the Power button, also hold down the Home button for 10 seconds
  • Without releasing the Hom button, release the Power button BUT keep holding the Home button until RedSn0w detects the device.

As soon as your iPhone enters DFU mode, RedSn0w will begin jailbreaking your device. Once the jailbreak process is completed, RedSn0w will tell you that rest of the process will be performed on the device.

You see the Pwnapple running on your iPhone, you’ll eventually get to the “Flashing Baseband” step.  THIS STEP TAKES A VERY LONG TIME to complete and there won’t be any feedback while its running.  Please just let it be for the next 3-8 minutes!  When the ramdisk has done its job it will reboot the phone on its own.

After the reboot, your iPhone 3GS will be running 05.13.04 baseband. You can unlock your iPhone 3GS/3G, Open Cydia, let it update, search for UltraSn0w and intsall it.

That’s it! don’t forget to share your experience in the comments section below…

How to Fix ‘No Signal’ and crashes Problem after baseband downgrade

If you’re facing ‘No Signal’ or crashes after downgrading your iPhone 3GS/3G baseband from 06.15.00 iPad baseband to 05.13.04, don’t worry you can fix it in a few steps mentioned below:

  1. Open Cydia and go to Manage > Packages
  2. Look for Mobile Substrate and Ultrasn0w
  3. First uninstall Ultrasn0w and then re-install it. Reboot your iPhone 3GS/3G This should fix the issue.
  4. If the problem persists, then uninstall Mobile Substrate and re-install it. Now reboot your device.

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118 comments… add one
Shuab June 19, 2012, 1:41 am

Really its a grate job without any doubt

vytas June 19, 2012, 2:29 am

omg, MuscleNerd, you’re so AWESOME!!! i’m crying out of happyness, my GPS is going to work again :)))

Tomas June 19, 2012, 3:02 am

I have Iphone 3gs, serial number xx015, I tried downgrading, but bb is still 06.15, and my iphone is not detecting any sim card

iPhoneHeat June 19, 2012, 3:48 am

Uninstall UltraSn0w and reinstall.. reboot
If the problem persists.. uninstall mobilesubstrate from Cydia and reinstall.. reboot

kike July 19, 2012, 6:20 am

first you got to reflash your baseband 06.15 with redsn0w then downgrade and enjoy

lecoq June 20, 2012, 8:07 am

still 06.15 baseband, what was wrong with my iphone? (old bootrom, 3GS, 5.1.1). Please help me.

knubis June 30, 2012, 10:09 pm

I have the same issue x:
did it on 5.1.1, 5.1, 4.1, 5.0.1, stock: 5.1, 5.1.1, 4.1, 5.0.1
Bust my base band is still 6.15.00 :\

Tomas June 19, 2012, 3:03 am

What could went wrong?

Baietu June 19, 2012, 6:08 am

Any1 with new bootrom have actually tried? I mean what are the chances of brick he “radio”,

Baietu' June 27, 2012, 1:43 am

I did!

New bootrom, downgraded perfectly on 3Gs IOS 5.0.1(9A405)
had the ipad baseband for long time and now, my location services are working like a charm… with more that normal battery consumtion….

just follow the instructions

on mine, on the pineaple logo, when said Flashing baseband (don’t interrupt) took like 4-7 minutes.. just make shure it has enough power and don’t press any buttons

i guess after enough readings.. there is said that you should not use this to UPDATE your baseband… but downgrading should be OK ..

mine works perfectly now!

bafta si succesuri!

lecoq June 19, 2012, 12:08 pm

I tried to downgrade BB many times, but it still stuck on 6.15, and my iphone hadn’t any signal (it could not detect the Sim card). Was there any wrong with this? My friends also had the same thing. Please help.

Mitchk9 June 19, 2012, 2:45 pm

i have now tried to do this twice but still on 6.15? i am a bit confused with my iboot my serial is 86003xxxxxx with a mixture of letters and numbers, is this new or old?
also is i use the downloaded IPSW 5.0.1 (9A405) it states that this device dose not accept teathered, when i use my IPSW it accepts it and dose the proccess but stay on 6.15?

Any advise please, i was so happy when the upgrade came out.

Thanks Alan

Harryvng June 19, 2012, 8:07 pm

It worked great for saving my problem with the GPS. Thank a lot to MuscleNerd and your work is so great.

Ca June 20, 2012, 4:58 am

Downgraded without Issues but GPS still is off I’ll try again to see if something changes

Alan June 20, 2012, 11:41 am

NO still 6.15 ? Have done it twice now but no change iPhone 3GS ISO 5.0.1 any advice please

Imran Chagani June 20, 2012, 2:40 pm

This method does not work on my iPhone 3GS (old bootrom) running iOS 5.1.1. I’ve done 6 times but baseband remains 06.15.00.

Also reinstalled iPad baseband and then again tried to downgrade it to 05.13.04 but no result.

I don’t know why this method is not working.

Tomas June 20, 2012, 6:09 pm

The same here, but my 3gs is running new bootrom. I used to be on 4.3.3 when I tried downgrade, but with no luck. Now I am on 5.1.1 with 6.15 bb, which was installed again, after every fail atempt.
Now I am waiting, till someone would tell what I am doing wrong.

sadeeque June 21, 2012, 9:01 am

whats ur serial # we might have the same problem!!

Tomas June 21, 2012, 11:53 pm

My serial number 82015
It doesn’t matter on whith os i am during the downgrade, After everything is done, my iphone is useless until I install 06.15 back again.

sadeeque` June 22, 2012, 4:03 am

My was still the same thing and with 6.15.00 i installed cydia, ultrasn0w, and fix no service 5.1.1 . No my phone is working fine.

Tzarde June 21, 2012, 1:14 am

Do a fresh ios install or upgrade then do the steps again.

sadeeque June 21, 2012, 9:00 am

Hello guys, please i need help !!!
I have an iPhone 3gs and its the three digits on the serial number is ***414 << thats weird, and when ever i try to downgrade it won't change still on the 6.15.00 is it because the serial number or what?
Please HELP :[

tonz June 22, 2012, 6:42 pm

my 3gs is running bootrom 84013. iso 4.3.3 when I tried (10 times)to downgrade connectting my phone to computer in DFU mode, redsnow says that “the baseband failed” that means it doesn’t downgrade…
iphone remain as before and it works …..

please working solution to downgrade baseband….thanks

bhim June 23, 2012, 11:02 pm

I have 3G iOS 4.2.1 bb 06.15.00, should I downgrade to bb 05.13.04 ?

iluvtrollin September 30, 2012, 7:11 am

YOu should because if you bring it into apple with baseband 6.15.00, they won’t help you.

bhim June 23, 2012, 11:03 pm

I have 3G iOS 4.2.1 bb 06.15.00, my iphone is running ok, still should I downgrade to bb 05.13.04 ?

hossein June 24, 2012, 4:50 pm

i can easily downgrade without any problem,
my problem solved

walcottit June 25, 2012, 8:38 pm

My phone is 3gs with iOS4.1 6.15.00 BB. How do i downgrade BB to 5.13.04. Do i need to upgrade to IOS 5.1.1. please help me.

sam June 25, 2012, 10:12 pm

thanks 😀

cyman June 26, 2012, 2:46 am

No downgrade. Everything done according to the instructions above and seemed to go OK. Still on 06.15.00 and there is “NO SIGNAL” issue. I’ve tried uninstalling/reinstalling Ultrasnow and Mobile Substrate, rebooting but nothing can bring my 3Gs, iOS 4.1, old bootrom back to work. WiFi OK but occasionally drops for 1-2 secs and goes back to full strength.
Any clue, any advice??

iPhoneHeat June 26, 2012, 3:19 am

Dev-Team is fixing some bugs.. stay tuned for an updated version 🙂

cyman June 26, 2012, 9:45 am

Hope that the updated version will cure all the problems. Will wait until Thursday (they’ve announced so). But, it’s completely weird that I have lost telephone capabilities of my 3Gs by doing the above downgrade process. In this stage it is nothing more than an iPod – music, videos & games.

Tomas June 26, 2012, 12:07 pm

Just reinstall iPad bb, it helped me get my phone capabilities.

cyman June 26, 2012, 1:34 pm

Thanks Tomas. That worked. Phone back. My hope remains for the coming update of 09.14b2 with regarding to the lost GPS issue. We’ve been waiting long time for that “small thing”.

jazzy June 26, 2012, 9:05 am

It worked like charm. First attempt was unsuccessful. DFU mode unsuccessful. It completed all steps but no Wifi and no signal. I did the dteps again. After completing all steps, its up and running. Thanks Dev-Team!! You are great!
BTW, I was running 3GS at iOS 4.1 with SN 89311XXX (old bootrom) at 6.15 baseband.

bbdl1700 June 26, 2012, 12:43 pm

I downgraded from 6.15.00 to 05.13.04 in my iPhone 3G with iOS 4.2.1 successfully. Everything is ok. But I don’t know whether GPS is working or not. How can I check it ?

bbdl1700 June 27, 2012, 7:51 am

After downgrade from 6.15 to 05.13.04 my iPhone 3G 4.2.1 drains battery completely after 3 hrs regular usage. How can I solve this problem ? Please help.

Mario June 28, 2012, 2:14 am

Worked fine on my iPhone 3G iOS 4.2.1

Valdet86 June 30, 2012, 5:22 pm

Good job with this new RedSnow, I succsesfully downgraded bb 06.15.00 to 05.13.04 on my iPhone 3Gs 32 gb old boot on ios 4.3.3 . The GPS works great, battery life seems to be the same. Good luck to all. Thank you Musclenerd!

standsteady July 2, 2012, 4:10 pm

Works great. finally got rid off 06.15.00 on my 3Gs iOS 4.2.1

lecoq July 5, 2012, 1:03 pm

Great. Well done. 🙂

cyman July 6, 2012, 1:10 am

b2 out. Worked like a charm. Evil 06.15.00 went to hell. After more than a year my 3Gs is finally complete – GPS working.

yeye Dj July 7, 2012, 4:24 am

Tengo un 3Gs con ipad baseban 6.15 y new bootrom, me sirve 0.9.14b2??? intento downgrade??

mw.gustavsson July 8, 2012, 1:17 pm

Worked fine but I got BB 05.16.05 and that can´t be unlocked by ultrasn0w. So do i want a phone or a GPS?

nas July 9, 2012, 6:41 pm

hi guys, im trying to upgrade iphone 3gs 4.1 to 5.1.1 but im no able to do so, i get an error(11) please help. thanks in advance.

yazsinoo July 10, 2012, 10:28 am

thank you for the new redsnow
at the begining I tried downgrade and ended with no wifi,no Mac address and no baseband all I did uninstalled mobile substrate and ultrasn0w rebooted ..nothing come up until I had the idea to retry again downgrading which was a good solution to downgrade to 05.13.04…I will try the unlock and gps..

yazsinoo July 10, 2012, 10:46 am

Iphone 3GS baseband downgraded unlocked with redsn0w and GPS working fine
thanks for MuscleNerd and all of you

Mw.gustavsson July 13, 2012, 1:53 am

Why do I get BB 05.16.05 when everyone else get BB 05.13.04?

padre_santo July 17, 2012, 5:43 am

i brick my radio is there anything than i can do to my iphone 3gs is newboot help

Sage_Sleeper11 July 18, 2012, 6:55 am

I did it and it looked like it worked but it still shows the the red disabled screen after turning back on

matt32432 July 18, 2012, 11:07 am

i tried entering dfu but got into recovery mode…

Sinzu July 18, 2012, 6:27 pm

Mine doesnt show the ramdisk image, just a black screen with led light, and stays for a very long time, and i stil get the bb 06.15 pls my iphone is useless as it stands now it only works like an ipod… music video pictures… HEEEEEELLLLLP

de_conne July 25, 2012, 1:19 am

Nice Job Guys!

Tried it today and Iphone 3G with baseband 6.15 and IOS 4.2.1 was successfully downgraded to baseband 05.13.04.
Also unlokking wit UltraSn0w works fine!

I did uninstall UltraSn0w after downgrade before reinstalling it.

Will test soon if GPS functions now work.


Davey MAc July 30, 2012, 5:26 pm

Hey guys, im running a 3g on 4.2.1 ipad bb and ran through the steps although i get a black screen after redsnow says completed. IS this normal? I am a little worried. A little help would be great, justjoeblogger on googles email. Thanks guys

AlainD August 15, 2012, 1:50 am

Just to help those who like me were desperate,

I was successful in downgrading from the iPad BB on IOS 5.1.1 on what is supposedly a New Boot ROM 3GS iphone (week 44). Before the downgrade, it was not bricked, but could not get any cellular signal (No signal/Searching…).

Here are my steps:

1-Clean restore to 5.1.1
2-Jailbreak (install Cydia) with simultaneous downgrade
3-Ultrasnow, rocky racoon.
4-Yeah !

shariyar August 28, 2012, 8:28 pm

i hv iphone 3gs ios 4.1 n 2day only i downgraded my bb from 6.15.00 to 5.13.04 it is new boot
i want to update ma iphone to 4.3.3 or higher n want to unlock it plz help its nt gettin updated plz help

michael September 3, 2012, 9:34 pm

thanks a lot! works perfectly here in philippines!
iphone 3gs ios5.1.1 new bootrom

Rupesh September 9, 2012, 4:13 pm

Totally worked for me. 3GS old bootroom 5.1

vedesh September 9, 2012, 9:33 pm

i have an iphone 3gs with the ipad baseband install on it…. the 3-5 digit of my serial number is 134…. can i do the downgrade to 5.13…. it work perfect with the ipad baseband but i want my gps to work…. plz recommend

iori September 12, 2012, 11:47 pm

Cab I jailbreak and downgrade the baseband of this Iphone 3gs?

Firmware 5.1 (9B176)
Serial Number 86002L553NQ
Modem Firmware 05.16.05

Thank you very much.

iori September 13, 2012, 11:41 pm

I forgot to say i checked the bootrom and is new bootrom … but the serial nuber digits 3-5 is 002 so ithink it may work but i need to be shure.
Thanks a lot.

Mg Thura September 19, 2012, 12:58 am

How to fix no wifi,no bluetooth,no IMEI, no basband in iphone 3gs please help me?

Dragos September 21, 2012, 11:54 pm

the process isnt starting :(. after it says done on the pc my iphone remains with a black screen ….(if i hold the power button it restarts my iphone)

arhib October 1, 2012, 2:22 am

Using a different PC worked for me after a black screen problem!

Dragos October 7, 2012, 1:00 am

Yeah it seems thats my pc problem, i did updated it but now i cant downgrade it …. if i downgrade ,the gps, wifi,and everything sais thats not installed and asks for an itunes restore -_- so im stuck on 6.15.00 until my mom brings my laptop next month

lewafer September 28, 2012, 12:52 am

um… why didn’t anyone mention that this is a TETHERED JAILBREAK?? I was unlocked on 6.15.00 untethered JB/unlock. After doing this, it’s now a tethered JB? I see nothing about this in the instructions. I’ve JBroken many phones and have never had to rely on a tether. If anyone has any wisdom, please chime in…


iluvtrollin September 30, 2012, 7:09 am

You selected Install iPad baseband in picture 3 in step 2

lewafer October 4, 2012, 1:35 am

I was already on the iPad baseband; I didn’t select to install it. I selected to downgrade BB and install Cydia. When it was finished, it said it was tethered. And after a few more tries to upgrade to a non-tethered one, the iphone is stuck in a white screen boot. It’s hosed; I’ll try again in 7 days or so once the batt has completely died to do a full restore…

jakechoo October 1, 2012, 11:03 pm

i have a iphone 3gs with BB 05.16.05…i tried to jailbreak it…now i lost the phone call icon i can’t make any call…just can receive’s like a ipod now…maybe i know what happen and how to solve it???
help please

Zero October 3, 2012, 2:21 am

iPhone 3G iOS 4.1 (8B117)
First 2 tries = failed
I updated my iTunes to the lastest version.
Next try = I couldn’t belive, I really downgraded my BB! o_O
Thanks so much, Dev-Team!

Karanbir October 7, 2012, 4:26 pm

Yahoooooooooooooooooooooo !!!!
It really works///
IPhone 3Gs IOS 4.1 (8B117)
Thanks to ton….!!!

gypsyjock October 8, 2012, 4:11 pm

worked a treat great stuff at 1st try there was no activation,second try activation but only one signal bar but no o2 uk no phone number in itunes for my sim card and cant make or receive calls,when i tried cydia i got network error no network connection,so i then installed a wireless adapter on my pc windows 7 then connected the iphone to pc with the adapter then went back to cydia and this starting updating the packages now up and running fine ,brill,however i would like know if i could ever restore from itunes in the futer if anything went wrong with the iphone 3g,would i beable to upgrade ios from 4.1 to 4.2.1 via itunes and keep my unlock is this possible after bb downgrade,before the bb downgrade and jailbreak and unlock i was getting 1015 error in itunes when i tried to upgrade ios to 4.2.1,, so i had to use ireb-r5 to kick it out of error code 1015 and install 4.1,any help would great,thanks in anvance,dont want to try anything with itunes without some advice as this is my 1st jailbreak and unlock,so dont know to much about these things,any advice on this matter would be very greatful,also how to save sshs blobs,uk,many many thanks for this great stuff the Dev team comes up with,regards gypsyjock

peca October 14, 2012, 12:25 am

i have iphone 3g ios 4.2.1. Downgraded from 6.15 to 5.13.04
but GPS still not working.
Please help!

Oryayo October 15, 2012, 10:49 pm


I was having “No Service/Searching…” on my IPhone 3GS using baseband 6.15.00. Network service was erratic and always going off intermittently.
I discovered that I was to downgrade the baseband to 5.13.04 as the original one had GPS, etc issues.
After downgrading, the network issue persisted, so I found that I had to uninstall and re-install Mobile substrate and Ultrasn0w for the network service to be restored.
I was able to uninstall but could not re-install as the service totally went off and I have no Wi-fi to use as an alternative.
I need to re-install the Mobile substrate but could not so I uninstalled Cydia Installer as well thinking I could get it back by re-jailbreaking.
This is however not working.
Kindly lease help me out pleaaaase?

Oryayo October 15, 2012, 10:56 pm

I was having “No Service/Searching…” on my IPhone 3GS using baseband 6.15.00. Network service was erratic and always going off intermittently.
I discovered that I was to downgrade the baseband to 5.13.04 as the original one had GPS, etc issues.
After downgrading, the network issue persisted, so I found that I had to uninstall and re-install Mobile substrate and Ultrasn0w for the network service to be restored.
I was able to uninstall but could not re-install as the service totally went off and I have no Wi-fi to use as an alternative.
I need to re-install the Mobile substrate but could not so I uninstalled Cydia Installer as well thinking I could get it back by re-jailbreaking.
This is however not working.
Kindly lease help me out pleaaaase?

Dragos October 16, 2012, 9:04 pm

Just try to make the baseband again 6.15.00 than try the downgarde. Idk why i had some issues too. First downgrade was a total fail ( no wi-fi, no gps, no sim, no baseband showing) . After that happened, i just reupgrade the baseband than again downgrade. idk why the second time it worked clean and smooth. maybe there are some small bugs.

Oryayo October 19, 2012, 7:08 pm

Thank you for your response, Dragos.
I tried restoring it with itunes but it got stuck in recovery mode with error 1015.
How do I get it out of recovery mode and ensure a permanent fix?

Dragos November 9, 2012, 8:48 pm

I’ve never came across this error :-?? but I heard of it and this guy can help you in fixing it, if you still have the problem.

Adriano Malfatti November 10, 2012, 12:10 am

abra o iREB 5 na segunda aba ha um botao para tirar do erro 1015

Dave February 15, 2013, 6:55 pm

download latest version of tiny umbrella & select ‘exit recovery’ works 100%. Had this problem before

Fredo November 4, 2012, 6:22 am

Hi, After downgrade my 3g 4.1 to 5.13.04 from 6.15 still no service. I followed your remove/install/reboot ultrasn0w and Mobile Substrate instructions. After that it doesn’t recognize my phone number, no carrier in settings and keep checking for Internet Tethering in network.
This phone was working fine for about one year at 4.2.1 – 6.15 BB when suddenly started dropping calls or showing just one bar, I did almost every suggestion under the sky to fix it, even put new sim card (verified with other cellular) and welded bypass wire on the back of circuit board.
More ideas please!

Dragos November 6, 2012, 8:00 pm

You should upgrade your ios to 4.2.1 again than just upgrade your baseband to 6.15 and downgrade it to 5.13. Maybe there are some ios issues. Anyways if this works you can downgrade your ios to 4.1. if not than it might be a hardware problem.

Fredo November 9, 2012, 2:49 am

Thanks Dragos,I’ve upgraded to 4.2.1, BB 6.15, unlocked with ultrasn0w, it recognizes my carrier but intermittently, sometimes gives No Service. When at 4 bars never can place calls, always Failed call.
As you suggested it might be a hardware problem. Any ideas where to start locking?

Dragos November 9, 2012, 8:42 pm

Uninstall than reinstall ultrasn0w and mobile substrate. If nothing changes than read bellow.

First of all try to shake your iphone and check if you still have signal. If you get the “no service” message when you shake the iphone , it might be from the antena. Also try to move a bit the SIM card slot (only if you can , don’t try to force it). I’m not that good at hardware problems but these can be the main reason why you get the “No Service” message.

Jeevs November 23, 2012, 10:56 am

I had 3Gs jailbroken with iOS 4.1, which was working fine. Tried upgrade to iOS 6.0.1 by:

1. Restore to ‘iPhone2,1_6.0.1_10A523_Restore’ using iTune 10.7
2. Choosing the ‘iPhone2,1_6.0_10A403_Restore’ IPSW, jailbreak using ‘redsn0w_win_0.9.15b3’.
3. Again using ‘iPhone2,1_6.0_10A403_Restore’ did just boot tethered.
4. Cydia shows 6.0.1

No error with above steps, but didn’t get service.

Then based on the suggestion, I tired:

5. Installed Ultrasn0w Fixer.

Still no luck, then tried:

6. Jailbreak again to Downgrade to iPad Baseband.
7. Using ‘iPhone2,1_6.0_10A403_Restore’ did just boot tethered.
8. Re-install Ultrasn0w Fixer.

Same.. No service still..

Please help


muysong November 28, 2012, 8:29 pm

it really work . thanks u very much

mckinley November 25, 2012, 5:42 pm

thank you very much it really works

Pogi December 1, 2012, 8:25 am

I have a iphone 3gs i i install ipad baseband and i downgrade to 05.13.04 no signal i have a name of my carrier but still no signal bar i install ultrasnow plss help

Dragos December 3, 2012, 6:06 pm

Offer more details, iOS?

Pogi December 4, 2012, 12:05 am

My ios is 4.1 And still no signal any one can help me about my iphone 3gs i buy this iphone in 2010 week 27

nik December 12, 2012, 1:42 pm

I jailbreaked and unlocked my iphone3g ios4.2.1 and baseband 6.15.0
But now no games are or entertainment apps present earlier are working.
Also whenever I try to download any app from APPstore it gives error that ios 4.3 is required.
Please guys suggest something.

hateraid December 16, 2012, 7:44 am

for this problem u gotta change ur iphone buddy.cus the minimum version of ios req is 4.3 now.and there is no update for iphone 3g after 4.2.1.
if u hav jaibroken it then add to source and intall Install0us.
u can download any app for free.u can download older version of apps there which may work on ur ios version

hateriad December 13, 2012, 7:07 pm

hi guys,
i have a iphone 3gs.Serial number **947****** and i think it has new is running on ios 4.1 with BB 6.15.00.
i wanna downgrade my bb and update it to ios 6.
and when i try to downgrade BB using redsn0w it always says “Downgrade Baseband Failed”.I donot know the reason but i want to downgrade my iphone’s BB and upgrade it to ios6.please help me.
Thanks alot.

lokes December 19, 2012, 12:01 pm

cydia doesn’t opens

rzzz December 20, 2012, 6:58 am


I have iphone 3gs, i got it unlocked its base band was upgraded to 6.15 and got it unlocked and cydia in it,
I did erase all trying to format it cleaning it all trying to remove cydia and installing latest upgrade version 6.0os, But now its all stuck to connect to i tunes, I went trying to restore it , it says cannot be restored, After some research came to know I have to downgrade baseband to lower version and try to restore it,
But through red snow I come to error exploit error,
Can any one help me out with detail procedure what can i try doing.

theikinz December 21, 2012, 6:18 pm

work’s and thank you bro….

louvillaruel December 25, 2012, 8:59 am

Hey guys! can anyone help me?!

I have this 3GS with
BB 06.15.00
Version 4.1(8B117)
Model MC131HB
IMEI 01-202600-038170-8

can I upgrade my version to iOS5.1.1?

thanks in advance

Deepak SHAW January 17, 2013, 11:01 am

No you cant the IPhone 3g’s hardware is not compatible.

sliva February 2, 2013, 9:05 pm

GPS does not work
1 flashed modem remained 06.15.00
2 flashed modem changed to 05.13.04 but GPS does not work
I tried several times pillowcase modem returned on 06.15.00
pomzhit advisable please
here is the video:

Anon February 12, 2013, 2:56 pm


My 3GS Serial number is xx95031xxxx. (i.e. greater than 134).
And baseband is 06.15.00.

My GPS is working. Should I still downgrade to 5.13.04 ?

Anon February 12, 2013, 3:00 pm

And I am on iOS 6.1. What is the benefit to move to BB 5.13.04 ?

Dragos February 13, 2013, 1:31 am

You said your GPS is working, Have you tried it without an internet connection? to see if it really works in a new location? other benefits idk, maybe the chance to use your iphone as a cellphone.

Anon February 13, 2013, 5:04 am

Yes, I am using the phone as my cellphone. ( I do see intermittent cellular connection loss, that used to happen before also). And without wifi maps wont load, but yes, a new location is displayed.

jorge February 26, 2013, 10:26 pm

Graciaaaaaaaaaaaaaaaaaaaaaaaaaaaaaas me funciono ahora ya agarra señal el iphone 3gs Muchas gracias.

ramze March 19, 2013, 7:53 pm

maiha man buanga mo!!!! bakakon ka!!!! balit intrimis la!!! salamat!!!

Covenstein May 11, 2013, 4:04 am

You say “disable Cydia if you already have in installed”…
Like, un-jailbreak? or turn off all the features? or what…
Thanks for your help,

DM May 30, 2013, 6:16 am

disable the “install cydia” checkbox, as in dont install it again since it is already installed.

rewind July 3, 2013, 10:17 am

it works for my iphone 3g, but still having problems w/ my gps signal, sometimes its not working, i have to reset my network setting and open my location services to have it working again. What will i do?? thanks

SJ July 15, 2013, 3:15 pm

my iphone 3g ios 4.2.1 baseband 06.15.00 i did everthing clearly which you have mentioned below but device is in black screen……. plz help me…..

thanking you…..

Dragos July 15, 2013, 9:34 pm

Try the same instructions on another PC again. I had a similar problem, i was using my own computer , it made the iphone to get in a restart loop (sometimes blackscreen). Also, try it on different operating systems (windows).

Zeeshan9300 July 17, 2013, 12:14 pm

I have an iphone 3gs with serial no this 859408K93NP
With 6.15 and ios 6.1.2
When i turn on my gps
I lose my cellular signals and my wifi
Can i use this method to downgrade to lower baseband?

Daniyal August 5, 2013, 11:28 pm

i followed all the steps but the only i problem i am facing is SAFARI & MAIL. Are crashing as soon as they open i have tried both steps.. but still no luck. i am using IPhone 3gs 5.1.1 modern firmware 05.13.04.. Thank you

surya October 4, 2013, 11:39 am

hi guys ,
i was using iphone 3g with 4.2.1 version.i had downgraded modem firmware 6.15.00 to 5.13.04 and after that when i looked to reinstall ultrasnow in cydia , i didnt find any ultrasnow/mobile substrate in cydia packages. can anyone help me in this and get out of this problem pleasee ..

Ytu March 20, 2014, 2:17 am

You are doing a really great job this tutorial save me you are my king thanks for this great tutorial i manage to have my iphone unloked again and i have signal after i did a stupid thing thank you again guys.

Muhammad Waqar September 23, 2014, 3:16 pm

i have iPhone 3gs base-band 6.15 ISO month ago my iPhone drop signal of Sim card.i restore again and then jailbreak.2 or 3 days work butt it show same problem again.i do again.butt it signals not i use in airplane mood.after 2 weeks it show connect to iTunes.when i connect to iTunes it say “some problem to service option please go to service center” please guide me what i do>>>>>

unlock iphone 4 ios 4.3.3 (8j2) May 5, 2015, 2:10 pm

Your iPhone Will Be Permanently Unlocked!.

wallace October 6, 2015, 12:10 am

redsn0w keep on saying downgrade baseband failed, and cant downgrade my baseband pliz help ive tried many solutions bt non of them work now im stuck with my wifi working but keeps on saying no service

Solomon May 13, 2016, 1:56 am

I am very very grateful! God Bless you in abundance with more wisdom. Thank you so so much. Finally, I’ve jailbroked, upgraded from 4.1 to 4.2 and finally unveiled my no service probs to Abundance of service. My iphone 3G is now back as normal. once more, thank you so much.
I am still stucked with another headache of which I believed you will help me through.
Its my iphone 5s and iphone 4s. I bought the two phones, I was unfortunate when I noticed that the iphone 5s is locked with icloud activation and that of iphone 4s is locked with UK orange (that it can’t accept other sims beside.
Pls, I need your help to get out of these mess.
Thanks a lot!

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