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warraich08
Guest
downgrade iphone 3gs 4.0 to 3.1.3 sucessfuly .
This could be only done if u have saved shsh blogs on O/S 3.1.3/ 3.1.2
Full Guide : Downgrade iOS 4 iPhone 3GS, 3G and iPod touch to 3.1.3 / 3.1.2 Video
May be you upgrading to iOS 4 and been slowed down your device and that you want to go back to iPhone 3.1.3 / 3.1.2. Or if you are one of those iPhone 3GS (new bootrom) or iPod touch 3G / 2G (MC model) user who has upgraded to iOS 4 only to find out that you cant jailbreak it can follow the instructions posted below to downgrade iOS 4.0 to iOS (formerly iPhone 3.1.3 or 3.1.2).
Step 1: Download the old iPhone OS 3.1.3, iPhone OS 3.1.2 ipsw firmware files.
Step 2: Put your device into DFU mode (not recovery mode).Connect your iPhone to your computer. Turn iPhone off. Start iTunes.Hold Power and Home buttons together for 10 seconds or so.Release Power button but keep holding the Home button until your computer recognizes a new USB device.iTunes will now recognize your iPhone.Note: Your iPhone screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.
Step 3 is for iPhone 3GS users only.
If you are on iPhone 3G or iPod touch 2G (non-MC model), skip Step 3 and continue from Step 4)
Step 3: This step is applicable to iPhone3GS, iPod touch 3G and iPod touch 2G (MC model) which have their SHSH blobs (ECID SHSH) saved on Cydia for the firmware you downgrading on. If you don
This could be only done if u have saved shsh blogs on O/S 3.1.3/ 3.1.2
Full Guide : Downgrade iOS 4 iPhone 3GS, 3G and iPod touch to 3.1.3 / 3.1.2 Video
May be you upgrading to iOS 4 and been slowed down your device and that you want to go back to iPhone 3.1.3 / 3.1.2. Or if you are one of those iPhone 3GS (new bootrom) or iPod touch 3G / 2G (MC model) user who has upgraded to iOS 4 only to find out that you cant jailbreak it can follow the instructions posted below to downgrade iOS 4.0 to iOS (formerly iPhone 3.1.3 or 3.1.2).
Step 1: Download the old iPhone OS 3.1.3, iPhone OS 3.1.2 ipsw firmware files.
Step 2: Put your device into DFU mode (not recovery mode).Connect your iPhone to your computer. Turn iPhone off. Start iTunes.Hold Power and Home buttons together for 10 seconds or so.Release Power button but keep holding the Home button until your computer recognizes a new USB device.iTunes will now recognize your iPhone.Note: Your iPhone screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.
Step 3 is for iPhone 3GS users only.
If you are on iPhone 3G or iPod touch 2G (non-MC model), skip Step 3 and continue from Step 4)
Step 3: This step is applicable to iPhone3GS, iPod touch 3G and iPod touch 2G (MC model) which have their SHSH blobs (ECID SHSH) saved on Cydia for the firmware you downgrading on. If you don