Downgrade from iOS 4.0.2 to iOS 4.0 / 4.0.1 (Mac and Windows)

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The 4.0.2 firmware has just been released, but despite the warnings, some of you had to install this new version. We propose a method in this tutorial you can easily revert to version  4.0 or 4.0.1.

DowngradeiOS4.0.2


1. File configurations:

1.  This first step is to “hijack” the connection to iTunes, to point it to another server different from that of Apple. We will use the hosts file to do this:

  • On Windows:
    1. Find the host file in C: Windows System32 drivers etc hosts
    2. Double click on Make host.Si you are asked which program to use to open the file, choose Notepad.
    1. In the file open, add in the last line: 74.208.105.171 gs.apple.com
  1. Save the file
  • On Mac OS:
  1. Find the host file in / etc / hosts /
  2. If asked what program to use to open the file, choose Text Edit, and then follow the same steps as for Windows
  3. If you can not ouvir file you need to use Terminal to edit (Terminal is located in the Applications> Utilities> Terminal): press enter at the end of each line
  • Type sudo-s
  • the password you put on your mac
  • vi / etc / hosts
  • type i to enter insert mode
  • Then copy the address 74.208.105.171 gs.apple.com
  • type:wq
  • and finally type exit

2. How to Downgrade [Mac OS X]:

1. Copy the application iRovery on your desktop, and install libsub as if it were any Mac application.

2. Now that the ground is prepared launch iTunes and click ” Restore “by holding down Alt . Select the file update 4.0 or 4.0.1 software for your device and will launch the restoration.

 After a few minutes you will have a small error 1015 (or 1011 or 1013) do not worry it’s normal!press ok!

3. Now open Terminal and type the following commands (each command terminator press enter):

  • cd Desktop
  • iRecovery-s
  • setenv auto-boot true
  • saveenv
  • fsboot (if you have an iPhone 3G French)
  • exit

Your iPhone is ready, you simply stay on the keys Home + Power until the appearance of the apple (reboot). Your iPhone is finally operational in 4.0 / 4.0.1

3. How to Downgrade [Windows]:

1. open iTunes and click ” Restore “holding down” Shift “(Windows) or
” 
Alt “(Mac OS). Select the file update 4.0 or 4.0.1 software for your device and will launch the restoration.

After a few minutes you will have a small error 1015 (or 1011 or 1013) do not worry it’s normal!press ok!

2. Start EasyiRecovery that have downloaded at the beginning of the tutorial. Click the first button, “download file necessari” then “da Esci Recovery Mode”

3. Wait a few seconds, then unplug the iPhone from your computer, restart the keys Home + Power until the appearance of the apple (reboot). Your iPhone is finally operational in 4.0 / 4.0.1  

4. How to Jailbreak:

 Then there remains only the jailbreak as before with JailbreakMe.com

  • Download The firmware 4.0 or 4.0.1 on your iPhone or iPod Touch
  • Download The latest version of iTunes (9.2.1)
  • Having saved the ECID on servers Saurik
  • Download iRecovery and LibUSB power Mac, or just EasyiRecovery for Windows.
  • Download EasyiRecovery v2.5 for Windows four.zero

 

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