One of Limera1n blog readers was able to downgrade his iPhone 3GS from iOS 4.3.5 to 4.1 firmware. Let's check his simple guide to downgrade 4.3.5 to 4.1 after the jump.
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 - follow previous our guide -
Step 4: Unlock your iPhone 3GS with ultrasn0w - follow our previous guide -
Download: Downgrade 4.3.5 to 4.1 iPhone 3GS - DHAKA MOBILE BD
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