How To Downgrade Your iPhone From iOS 4.0.2 To iOS 4.0.1/iOS 4 Without SHSH Blobs [Mac]

This is really an awesome news for those who have upgraded to iOS 4.0.2 and want to downgrade it back to iOS 4.0.1 to take advantage of JailbreakMe (as the iPhone Dev Team is not planning to release a jailbreak tool for iOS 4.0.2). Until now, it is only possible if you have saved SHSH Blobs for iOS 4.0.1. But, it looks like there is a possibility of downgrading from iOS 4.0.2 to iOS 4.0.1 or iOS 4.0. With that said, lets not waste any more times and get started. Let us know if this work around worked for your.

Warning: Please do it on your own risk. We will not be responsible for any damage or breakage of your iPhone.

Step 1:

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

Step 2:

Rename the downloaded file extension from .ipsw to .zip

Step 3:

Now, extract the .zip file that you have just changed.

Step 4:

Open the Buildmanifest.plist with TextEdit

Step 5:

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

Step 6:

Here, In the pop up window Type “8A306″ (if you are using iOS 4.0.1)/ “8A293″ (if you are using iOS 4.0) in Find Field & “8A400″ in Replace field

Step 7:

Click on “Replace All” and Save the File

Step 8:

Now, Open the Restore.plist with Text Edit

Step 9:

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

Step 10:

Here, In the pop up windows Type “8A306″ (if you are using iOS 4.0.1)/ “8A293″ (if you are using iOS 4.0) in Find Field & “8A400″ in Replace field

Step 11:

Click on “Replace All” and Save the File

Step 12:

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

Step 13:

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

Step 14:

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 13)

Step 15:

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

Step 16:

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

Step 17:

Click on Finder and while holding SHIFT + COMMAND Key press “G”.

Step 18:

In the field type /etc/ and Hit enter.

Step 19:

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

Step 20:

Now, add the following line at the bottom of the file (if you have in the file comment it out by adding # in front of the line)

Step 21:

Now, click on File and select Save As and save it on the desktop. (Make sure you un-check “if no extension is provided” and remove the txt. The file should not have any ext.)

Step 22:

Go back to the desktop and drag the hosts file into the etc folder. You need to authenticate it, enterpassword and click on replace to replace with the updated one.

Note: To double check if you updated the hosts file – Open one more terminal Windows and type “ping” you should get some thing like this ..

PING ( 56 data bytes

Step 23:

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 24:

Now, it time for us to restore the firmware – Hold down the “Option” key and click on “Restore“.

Step 25:

Select the Firmware and click Open to start the restore.

Step 26:

That’s it! Now, you can just sit and relax and let the restore finish.


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