Downgrade iOS 4.2 to iOS 4.1, iOS 4.0.1 (iPhone, iPod Touch)

In this guide you’ll learn how to downgrade iOS 4.2 to iOS 4.1 / 4.0.1 on iPhone 4, 3GS, 3G and iPod Touch 4G, 3G, 2G. Follow the steps below to downgrade iOS 4.2 to 4.0.1/4.0 firmware on iPhone and iPod Touch.


downgrade ios 4.2
iOS 4.2 is not jailbreakable ATM. So, if you want to jailbreak iPhone 4, 3GS, 3G or iPod Touch 4G 3G, 2G then you MUST downgrade to iOS 4.1 or 4.0.1 first. iOS 4.1 jailbreak is expected soon via GreenPois0n.

In this guide we’ll discuss following two methods to downgrade iOS 4.2 iPhone / iPod Touch firmware:

  1. Using TinyUmbrella (Recommended)
  2. By Editing Hosts file

IMPORTANT: iPhone 4, iPhone 3GS, 3G, iPod Touch 4G, iPod Touch 3G, 2G users MUST have SHSH blobs saved for 4.0.1/4.0 firmware in order to downgrade from iOS 4.2.

How to: Save SHSH blobs for iPhone, iPod Touch

How to Downgrade iOS 4.2 to iOS 4.1, iOS 4.0.1

Download your desired firmware for which you’ve SHSH blobs saved and want to downgrade to:

Method 1: Using TinyUmbrella

Download TinyUmbrella from the link below:

If you’ve SHSH blobs saved on Saurik’s server via Cydia, download them into your computer first. To do that:

  1. Connect your device, Fire up the TinyUmbrella and Check mark the Advanced Options.
  2. Select your device, firmware (the one for which you’ve SHSH saved at Cydia; 4.1, 4.0.1 or older) and Cydia as Location.
  3. Hit the save My SHSH button. that’s it.

Step 1 – DFU Mode

Put your iPhone into DFU Mode (How to: enter DFU Mode)

Step 2 – Start TSS Server

  1. Run the TinyUmbrella
  2. Hit the Display SHSH button to confirm that downloaded SHSH blobs has been cached by TinyUmbrella for 4.1, 4.0.1 or older. (If you already have them in your PC, drag and drop the SHSH blobs in the TinyUmbrella window then hit the display SHSH blobs button to confirm).
  3. Then hit the Start TSS Server button.

Step 3 – Restoring the Firmware

  1. Now Open the iTunes.
  2. Hold down the Shift (Windows)/Alt (Mac) key and hit the Restore button.
  3. Select the downloaded firmware (iOS 4.1, iOS 4.0.1 or older) and let the restore process complete.

iTunes will bring up error 1015, 1013 or 1011 message. Don’t worry, it’s normal. You’ve successfully downgraded your iPhone/iPod Touch firmware.

downgrade ios 4.0.2

Step 4 – Getting Out of Recovery

Now in order to get out of recovery mode, hit the “Kick Device Out of Recovery” button on TinyUmbrella right below the Start TSS Server button or you can also use RecBoot. That’s it!



Method 2: Edit Hosts File

**We assume that you’ve SHSH blobs saved via Saurik’s server.

Download your desired firmware for which you’ve SHSH blobs saved and want to downgrade:

Step 1 – DFU Mode

Put your iPhone into DFU Mode (How to: enter DFU Mode)

Note: Apple is currently signing iOS 4.1. If you’re downgrading to iOS 4.1 then you can skip Step 2 and continue from Step 3. Once Apple stops signing iOS 4.1, Step 2 will become compulsory for iOS 4.1 as well. If downgrading to iOS 4.0.2, 4.0.1 or 4.0, you MUST follow Step 2.

Step 2 – Editing Hosts File

Now we are going to redirect iTunes from Apple Servers to Saurik’s server.


Windows:

Go to C:\Windows\System32\drivers\etc\ and locate hosts file.
Open the hosts file in Notepad.
NOTE: Win 7 and Vista users MUST run Notepad with admin privileges. Right click on Notepad app and select Run as Administrator.

Mac OS X:

Go to \etc\ directory and locate hosts file. Copy it on your desktop
Open the hosts file in TextEdit.


Add the following line at the end of the hosts file and then save and close the file:

74.208.105.171 gs.apple.com

Mac OS X users needs to copy the edited hosts file from desktop back to /etc/ directory and replace the older one.


(Click to enlarge)

Step 3 – Restoring the Firmware

  1. Now Open the iTunes.
  2. Hold down the Shift (Windows)/Alt (Mac) key and hit the Restore button.
  3. Select the downloaded firmware (iOS 4.1, iOS 4.0.1 or older) and let the restore process complete.

iTunes will bring up error 1015, 1013 or 1011 message. Don’t worry, it’s normal. You’ve successfully downgraded your iPhone/iPod Touch firmware.

downgrade ios 4.0.2

Step 4 – Getting Out of Recovery

Now in order to get out of recovery mode, hit the “Kick Device Out of Recovery” button on TinyUmbrella right below the Start TSS Server button or you can also use RecBoot. That’s it!

You must now remove 74.208.105.171 gs.apple.com line from the host file and save it. Doing this will let iTunes to prompt you about future updates from Apple.

Jailbreak iOS 4.0.1

How to: Jailbreak iPhone 4 iOS 4.0.1

How to: Jailbreak iPhone 3GS, 3G iOS 4.0.1

How to: Jailbreak iPod Touch 3G, 2G (MC, non-MC) iOS 4.0.1

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Updates:

Downgrade iOS 4.3.3

27 comments… add one

Wakaas September 19, 2010, 8:30 pm

Hi. I upgraded my 3GS accidentally to 4.1 It’s baseband is also upgraded to 5.14.02. Now I hav downgraded it via tiny umbrella to 4.0.1 but it’s baseband is still 5.14.02. I depend on unlock. Any guide to downgrade baseband? Help needed.

iPhoneHeat September 20, 2010, 1:40 am

Not possible..
wait for the UltraSn0w update

Wakaas September 20, 2010, 12:44 pm

Ok. Thanx for ur reply.

miannadeem September 20, 2010, 1:20 pm

wakaas u r right

Daniel September 20, 2010, 5:13 am

No,there is no way to change the baseband,ultrasnow 1.11 unlocks it but it gets stuck in searching or no service.
We will have to wait.

Jules_f September 20, 2010, 4:06 pm

how can i by pass the ” SIM card is not supported” i have a locked phone 3gS with 4.1 installed. i want to use it with my carrier. thanks

Wakaas September 20, 2010, 8:05 pm

check ur modem firmware in settings>general>about. If it’s 5.14.02. Then it’s NOT unlockable at the moment

Jules_f September 21, 2010, 10:39 am

Thanks Wakaas,

but i cant get through the iphone yet to work on it, since i dont have the AT&T card and still getting message saying that sim card is not supported. i need to bypass this message first.

Wakaas September 21, 2010, 12:22 pm

To make it easy for u upgrading to 4.1 also upgrades ur baseband and it’s not unlockable at the moment. You have to wait for next jailbreak tool and ultrasn0w update. All u can do is to buy a phonebook simcard so it can activate ur phone so u b able to use it as iPod

Jules_f September 21, 2010, 1:07 pm

thanks Wakaas

i thought so, but i said i will ask the Gurus. please update me in case something new comes up. keep the good work guys. we count on you

Jules_f September 22, 2010, 2:47 pm

Hi,

i was able to bypass the sim card issue and now i am using the iphone as ipod until a new solution comes up.

any news or updates, i have now 3gs new bootrom,4.1 firmware and modem firmware 05.14.02

am i in deep trouble to unlock or jailbreak

Black Spider September 20, 2010, 6:27 pm

Thanks For This Guide

Zack September 20, 2010, 7:14 pm

All these websites such as this one,redmondpie etc are a joke all the cooment dissapear.And offer all this great forums,but you don’t publish half of what people say.

iPhoneHeat September 21, 2010, 2:43 am

How can I help you? :)

Angad2175 September 21, 2010, 11:33 am

Hi
How is this possible that site like iphoneunlocking.com claim they can unlock and add cydia app. On ios 4.1 to both iphone 4 and 3gs yet there is no official jailbreak availabe and people are claiming hackers cannot jailbreak it soon .. And should i buy tht software or just wait for greenpoison
Helpppppp plzzz

iPhoneHeat September 21, 2010, 9:20 pm

Legit jailbreak and unlocking tools are FREE..
Don’t purchase anything.. We’ll update the blog as soon as the new tools are out.

Angad2175 September 20, 2010, 10:06 pm

Hi
How is this possible that site like iphoneunlocking.com claim they can unlock and add cydia app. On ios 4.1 to both iphone 4 and 3gs yet there is no official jailbreak availabe and people are claiming hackers cannot jailbreak it soon .. And should i buy tht software or just wait for greenpoison

xavier September 21, 2010, 9:09 am

iphoneunlocking.com and smilar sites are scam… it will be total waste of money n u cant get a refund those sites claim they will give refund but they never will ..also you wont be able to unlock 4.1 from any of this sites..they will give away free jailbreaking tools which where made for ealier versions… belive me i did my homework on it.. your best option is to wait for greenpois0n.

Wakaas September 21, 2010, 10:31 pm

True

rabin September 23, 2010, 9:39 pm

can i downgrade my iphone3g running ios 4.1 and even i have already downloaded itune latest version 10 please can u help me can i downgrade my iphone3g4.1 to 4.0.1 the latest version of itune or i need to downlaod lower versin of itune plz help me

yanney September 25, 2010, 9:51 pm

hi. can u help me downgrade my iphone 3gs 4.0.2 to 4.0.1 ??? tried the steps but i can’t kick my phone out of recovery using tinyumbrella, like i can’t hit the “kick out of recovery mode” button.
thanks! help is much appreciated.

Muhammad Younas September 26, 2010, 9:56 pm

how to downgrade from 4.0.2 to 4.0.1 when dont have shsh saved in sydia server.

can we jailbreak iphone4 ios 4.0.2 or 4.1 or 4.2?

Fariz October 3, 2010, 10:25 pm

hi, any hack for iphone 4 baseband 02.10.04 in ver. 4.0.1 and its has been jailbroken?

hasan December 19, 2010, 5:34 pm

i dont have hosts file when i go to c windows sysytem32 drivers ets and i could not find hosts file there as i tried to rename it and it became somethingelse then i tried to make my self this hosts file but still i cant restore it is givig same error 3194.
the picture u showed above that of notepad have many things written but when i open my notepad nothing is written its empty then i tried to copy the same thing but still not working i m using window xp any solution plz.picture of my

mustang305 December 24, 2010, 8:42 pm

hey there.i tried doing the downgrade with tiny umbrella, my iphone4 came in version 4.2.1 and i cant downgrade it.ihave tried with many different versions. when i connect it to tnyumbrella it sais invalid x.x.x(xxx0

iyappan February 5, 2011, 1:04 am

hi dear,
thank you for your all helping here.. i have big problem in my iphone 3gs 32gb. i made mistake.. i update my iphone to 4.2.1 firmware, ipad baseband 06.15 .. after that my phone hanging in recovery mode. i try to do something to come out from that dfu mode. but i could not. pls help me. i am trying to downgrade by tiny umbrela 4.0. but i cant. i dnt know how do solve this problem. i trying to unlock my phone. thats y i did mistake. pls help me to downgrade and unlock mu phone. please. waiting for your help. thank you..

Its"Captin"JackSparrow May 1, 2011, 12:55 am

I have a ipod touch 2nd generation. Am i able to jailbreak it?

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