Dev-Team has release RedSn0w 0.9.6b4 to jailbreak iOS 4.2.1 on iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad. RedSn0w 0.9.6b4 jailbreaks iOS 4.2.1 with working Cydia and MobileSubstrate. Step-by-step instructions on how to jailbreak iOS 4.2 with RedSn0w 0.9.6b4 after the jump…
RedSn0w 0.9.6b4 is capable of jailbreaking all iDevices on iOS 4.2.1 however, newer devices are tethered jailbreak only. A tethered jailbreak means that each time your device loses battery power or needs to be rebooted, you must attach it to a PC or Mac to boot into the jailbroken state.
Untethered Jailbreak: iPhone 3GS (old bootrom), iPhone 3G, iPod touch 2G (Non-MC)
Tethered Jailbreak: iPhone 4, iPhone 3GS (new bootrom), iPad, iPod touch 4G, iPod touch 3G, iPod touch 2G (MC Model)
WARNING: unlockers please stay far far away from this official firmware (and all official firmware). Wait for the ability to create custom 4.2.1. IPSWs that don’t update your baseband! If you’re not an unlocker, read on!
Lets jailbreak iOS 4.2.1 firmware on iPhone 4, 3GS, 3G, iPod Touch 4G, 3G, 2G and iPad with RedSn0w 0.9.6b4.
How to Jailbreak iOS 4.2.1 with RedSn0w 0.9.6b4
- Download iOS 4.2.1
- Download RedSn0w 0.9.6b4 for Windows [Mirror 1] [Mirror 2]
- Download RedSn0w 0.9.6b4 for Mac [Mirror 1] [Mirror 2]
- Download iTunes 10.1
Connect your iDevice to the iTunes 10.1 and restore iOS 4.2.1.
ATTENTION iPhone Users: iOS 4.2.1 will update your baseband which is not unlockable ATM.
Once your iPhone / iPod Touch / iPad is running iOS 4.2.1, execute the downloaded RedSn0w 0.9.6b4.
Hit the Browse button and select the downloaded iOS 4.2.1 firmware. RedSn0w will recognize the firmware, now hit the Next button.
Now select your desired options. Make sure that atleast Install Cydia is selected. Now hit Next button.
RedSn0w will ask you to turn off your device. When it’s off and plugged in, hit the next button.
Now you’ll be instructed to put your device into DFU Mode. Follow the on screen instructions.
Once your device goes into DFU mode, RedSn0w will start jailbreaking it. Once done, you can find the Cydia icon on your iPhone / iPod Touch / iPad home screen.
That’s it. You’ve successfully jailbreak iOS 4.2.1 on iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad with RedSn0w 0.9.6b4.
How to Boot Tethered jailbroken Device after reboot:
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it is not work on 3gs newbootrom
jailbreak done,thanks to all
redsnow giving me waiting for reboot & nothing to do then i press power & home button then giohng to update please tell me what to do my phone still not jailbreaking
same problem with me any one help plz
Change red snow to run in windows xp service pack 2
its happenging with me too
Could be because you didnt restore your ipod before jailbreak and had stuff on it e.g songs ect.
This link is dead… or upload not done?
so, has the Cydia been working properly on 3GS now?
mirror 1 is dead …
Done. Fully working. I’m under the impression 4.2.1 on my 3G is slighty more responsive.
I thought if you saved your SHSH you could have an untethered one for iPod 4g and stuffs.
aparently not, hope they get it untethered quickly though
when the unlock for 5.15.04
what the hell of 5.15.04 is,
LOL just upgrade locked 3G/S to 4.2.1
When to restore, i got message error like this:
“The iPhone “iPhone” could not be restored. An unknown error occurred (3014)”
What happened? Help me please…
redsnow keeps locking up halfway through, any ideas
it says it works for itouch 2g mc but redsn0w says otherwise says not compatible yet(never has been).
I had that issue on windows 7 64 – make redsnow run in XP mode
OK so how much longer for the unlock? and what about the people who lost the wi-fi on their phones due to an update will it be an unlock that not require Internet connection?
cydia faild installling
What are the basebands and bootrom that this Jailbreak will not unlock?
Cydia is not work.
I jailbroke my iPod touch 2g, its fine and cydia is fine, only error is the multi-tasking when i try to swap app my device shuts down.
guyz i’m wondering about this jailbreak, what’s the effects with it?
What device do you have?
Well…. I earlier said that my 3G is fully JB, but I do get a lot of crashes, I’m constantly running in safe mode…. Waiting for some updates I guess…
My iPad was working great after the jailbreak and such. Installous wasn’t working for me so I shut it off and tried to turn it bakc on. But, it didnt=’t work so I went ahead did the tethered boot. And it’s going swell.. then when it gets to waiting for reboot. My iPad isn’t responding to it; for some awkward reason.
dead link 🙁
im not restore the new OS 4.2.1
I have a iphone 4 and am not able to install winterboard once I get cydia to install. I keep getting the message of size mismatch
i want to buy iphone 4 can anybody help
me with that
I have a Iphone 3gs jailbroken unlocked firmware: 5.12.01 version 3.1.3 (7E18)
I don’t know if it’s old or new bootrom….
can i update to 4.2.1 and unlock with (new)ultrasnow ?????
please answer, i am a new one 🙁
Works Perfect with my Ipad . Hope untethering will hapeen soon. thank you
i have downloaded iOS 4.2.1 firmware . on to my computer but when run the jailbreak and browsefor the downloaded iOS 4.2.1 firmware, the correct file is not there. can anyone help me pleeeease.
guys if my iphone serial number’s 4th and 5th digit is 17, does it mean my 3gs is old bootrom?
I tried it but the cydia didn’t work can you help me with this issue
I Phone 3GS New Bootroom, jailbreak 4.2.1 works, but the Phone doesn’t boot 🙁 I’ve tried it with redsnow and the terethered boot, for a short time u can see the pinenapple than black screen and the normal apple logo and the connect Phone to Itunes picture 🙁
Need help please
i had updated 3g to 4.2.1 and when it coplets phone start and ask for authorized sim card i dnt have this any other way plz help….
Thanks a lot.
it keeps freezing up in the exact same spot…get 11 bars into the screen Exploiting with limera1n and it won’t go any farther. Have tried over and over…HELP
stuck also at the screen “Exploting with limera1n”, won’t go further too. need HELP
ei nick, have you now jailbreakd ur ipod?,
ei nick, have you now jailbreakd ur ipod?, i also got freeze in exploiting limera1n, hey iphoneheat?, whats is oour problem why is it that we cant jailbreak our ipods?
I have an iphone 4 with 4.2.1 installed. Tried using RedSn0w 0.9.6b4 but it keeps freezing and redsnow stops working ! Any ideas please
its not working for my 8gb MC model ipod touch 2ndGEN..says `this version does not support 2Gen ipods mc models yet`..even tried running in different compatibility modes..wat to do..help guys…
I am also getting the “Exploting with limera1n” freeze. It’s exactly halfway through the JB when it stops here. I am using a iPod Touch 3g.
I am having same problem with same device please someone help us.
Same here! Im getting really frustrated with this!
Try latest RedSn0w: http://www.iphoneheat.com/2011/10/download-redsnow-099b6-ios-5-jailbreak/
try another USB port or computer
Ok. So I jailbroke my ipod and i have cydia and stuff but how do i get all the apps to be free?
Where do i go on Cydia to get the package to get all the free apps?? 🙁 please help!!
I jailbroke my ipod touch 2nd gen. on, 4.1 with greenposi0n.
I’m on cydia, and how do I get all the apps in the app store to be free?!?
I don’t know where to go!
I have a 4G 4.2.1 factory unlock Iphone.. have done jailbreaking using iOS 4.2.1 with RedSn0w 0.9.6b4..however, if i turn off and turn it on it stuck with apple logo and does not go any further. Again, I have to restart using tethered to access my phone..have restored to original firmware three times and jailbroken and same thing happens
CAN ANYONE HELP ME PLEASE!!!!
Same problem for me 🙁 HEEEEELLLLPPPPPP…!!
cydia isnt working. its just a white application
ok. the i clicked on the cydia and nothing came up on my ipod.Help?
just email me and ill send you a new redsn0w0.9.6b5 not redsn0w0.9.6b4. my email is
RedSn0w freezes part way through jailbreak for ipad. Can anyone lend any advice ?? followed steps above with no problem until the freeze.
ok i have an iphone 3g ios 4.2.1 with the 06.15.00 baseband and i cannot multi-task. when i try it goes into safe mode. i jailbroke with redsn0w redsn0w0.9.6b5. anyone have any suggestions or solutions.
downgrade back to 4.1
i had the same issues and couldn’t take the it safe mode message any more
have had no issues since i’ve downgraded
i have my shsh blobs saved for all firmware from 4.0 so i start tiny umbrella
i then use redsn0w 0.9.6b6 to enter dfu mode “that’s the only option ticked”
i open itunes and “device in recovery mode detected” comes up
i restore with a custom firmware from pwnagetool and then run thru the process of updating cydia, installing SAM and unlocking with ultrasn0w
not sure if it will work for you but its perfectly working for me
am using windows 7 btw
mine gets to the end and says windows has stopped workin we are now closing program.. what do i do?
I’ve already updated my OS through Itunes and now my iPhone 4 running OS 4.2.1, dose this process works for me too or I’m going to lose my data after jail-breaking?
Thanks! worked great!!!
Guys my iphone 3gs which i got it from uk is struck on the boot screen after i tried erasing all the data, kindly help i tried, holding home and the power button option, and the iphone is not being detected by the i tunes as well pls help me
my iphone 4 could not connect to itunes after installing the jailbreak.
please advice me what to do.
check your USb cable. May be try another one.
Or plug it into another computer.
hi,, my firmware of iphone 3g is 05.15.04. but why i can’t jailbreak use that?? please help me i’am newbie
always get hang on uploading ramdisk after dfu mode
i went through red snow mirror 1 and my device is a 2g one and cydia isn’t loading on mine is it my iOS or the red snow btw im using windows
anybody can help me? after all the step completed, the time my iphone 3g reboot, the apple icon show up not pineapple icon show up…. then the iphone jus cannot boot up and hang in boot up apple icon…..
Matur suwun gan 3Gku wes isoh dijailbrake.. uapik tenan tutoriale..
pls help me my iPod did not jailbreak……and it hanged
download a software which has jailbreaked and then install it through iTunes 9.2 the website I have written which u can download jailbreaked software
it won’t finish completing the jailbreak. its been frozen for hours. i’ve tried it two times. Now it won
t turn on. What should I do? I need help!
plug it in to the computer using iTunes an restore your device. That’s what happened to me at first so i restored it.
my firmware will not show up in any files when I load up redsn0w, I have already downloaded it and saved it to computer.
thank you very much developers you are the first to help me thanks
Thank you very much. It worked just fine for me
its stuck at uploading ramdisk
Cydia is asking me to update, how do I go about doing this? Any links you could direct me to?
in the redsnow application, after i try to enter DFU mode it just says “Exploiting with limera1n” and just stays there, what do i do?
after doing all of this icant fina a cydia icon on my i phone 3g….
how long it will take donwloading jailbreak data
i cant find the cydia app either i have this twice already and no app please help
hi, ive been trying to jailbreak my ipod touch 3g ios 4.2.1 with redsnow and i do every step but it always freezes at limera1n and i dont knpw what to do
for me its works till the device being processed part however its taking wayyy too long and it wont update