How To Downgrade Your iPhone From iOS 4.0.2 to iOS 4.0.1/iOS4 Without SHSH Blobs [Windows]

Step 1:

Download iPhone Firmware Version (iOS 4.0.2 & iOS 4.0.1/ iOS 4.0)

Step 2:

Now, extract the ipsw file that you have just changed using WinRaR

Step 3:

Open the Buildmanifest.plist with Notepad.

Step 4:

Now, Click “Control” + “F” to get the Find Windows

Step 5:

Here, Find and replace all “8A306? (if you are using iOS 4.0.1)/ “8A293? (if you are using iOS 4.0) with “8A400?.

Step 6:

Now, Open the Restore.plist with Notepad

Step 7:

Now, Click “Control” + “F” to get the Find & Replace Windows.

Step 8:

Here, Find and replace all “8A306? (if you are using iOS 4.0.1)/ “8A293? (if you are using iOS 4.0) with “8A400?.

Step 9:

Now, take the iOS 4.0.2 firmware file, rename its extension from .ipsw to .zip

Step 10:

Extract the iOS 4.0.2 file that we have just rename its extension and leave it open.

Step 11:

Now, move all the iOS 4.0.1 / iOS 4.0 files to iOS 4.0.2 windows (Folder that we have open in Step 11)

Step 12:

Once moved, Delete all the dmg files that have 002 at the end, leaving only the 001 files left and Close this windows.

Step 13:

Now, Change the iOS 4.0.2 firmware extension to .ipsw from .zip

Step 14:

Navigate to the following folder “C:\Windows\System32\drivers\etc”

Step 15:

Now, look for the file name hosts and open it with Notepad

Step 16:

Add the following line at the bottom of the file (if you have 127.0.0.1 gs.apple.com in the file comment it out by adding # in front of the line)

74.208.10.249 gs.apple.com

Step 17: