Tip & How-To about Cell Phones

Downgrade iPhone 4, 3GS from iOS 4.0.2 to 4.0.1 Without SHSH Blobs Saved [Update x1]

Download iOS 4.0.1 ipsw from here.
Extract it with WinRAR or WinZip to a folder on the desktop. You may need to rename the firmware file from .ipsw to .zip to do this.
Open the buildmanifest.plist with the Notepad if you are on Windows, or TextWrangler if you are on Mac.
Search and replace all – 8A306 with 8A400. Save. Repeat the same with the file restore.plist.
Download iOS 4.0.2 ipsw from here and open this with WinRAR or WinZip.
Note: Do not extract it. Just open it and leave it open. You must use this exact file and not create a new one. If you have to create a new one for reasons like you are on OS X, then use zip command line not explorer or finder to make the zip. I will assume you are using the original file opened in WinRAR for the rest of this guide.
Take all the files from iOS 4.0.1 and drag them over to the iOS 4.0.2 zip archive that you have open.
Delete all the .dmg files that have 002 at the end, leaving only the 001 files left.
Save the archive, and rename it back to .ipsw if you changed the name to get WinRAR/WinZip to open it.
Put the device in DFU
Now simply open iTunes and restore the firmware you changed.
This is it, you should now be able to jailbreak and unlock your device on iOS 4.0.1 with JailbreakMe

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