Why to downgrade 4.3.5 to 4.1 iPhone 3GS?
As most of you know that iOS 4.3.5 only have tethered jailbreak which mean that you have to connect your iPhone 3GS to PC every time you reboot it. When you downgrade 4.3.5 to 4.1 iPhone 3GS you will be able to get untethered jailbreak.Required downloads to downgrade 4.3.5 to 4.1 iPhone 3GS:
Download Ireb4.Download - Part 1 - Part 2 - iOS 4.1 custom firmware (made by sn0wbreeze)
Download redsn0w 0.9.6 (mirror)
Download iTunes 10.4
How to downgrade 4.3.5 to 4.1 iPhone 3GS :
Step 1: Run Ireb4 , your iPhone 3GS will enter dfu mode.Step 2: Go to iTunes and flash 4.1 custom firmware ipsw.
Step 3: Jailbreak your iPhone 3GS with Redsn0w 0.9.6b6
Step 4: Unlock your iPhone 3GS with ultrasn0w
Note: We have not had a chance to verify this guide, so if you gonna try it, please feed us back.
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This works perfectly for me, I recently downgraded my iphone from 4.3.5 to 4.1 customized firmware ipsw and the good thing was that there was no need to jailbreak it as it comes with cydia build in.
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