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:
Now, click on File and select Save
Note: To double check if you updated the hosts file – Open one more terminal window and type “ping gs.apple.com” you should get some thing like this ..
- PINGING gs.apple.com [74.208.10.249]: 32 data bytes of data:
Step 18:
Now, grab your iPhone, plug it in and lets put your iPhone into DFU mode.
- Here, iTunes will alert your that “iTunes has detected an iPhone in recovery mode. You must restore it before it can be used.” Click okay
Step 19:
Now, it time for us to restore the firmware – Hold down the “SHIFT” key and click on “Restore“.
Step 20:
That’s it! Now, you can just sit and relax and let the restore finish.
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