A few days ago Apple teleased iOS 4.1 beta.But we didn’t know how to downgrade iOS 4.1 to 4.0.1/4.0/3.1.x for iPhone 4, 3GS, 3G and iPod Touch.Here’s a complete guideline to downgrade iOS 4.1 to 4.0 / 3.1.3 / 3.1.2 on iPhone 4, 3GS, 3G and iPod Touch 3G, 2G.
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iOS 4.1 beta is now available for download to developers. If you’ve already updated to iOS 4.1 to see if the Antenna issue has been fixed or to find out what’s new in iOS 4.1 beta but could not find it impressive or want to downgrade because Spirit jailbreak for iOS 4.0.1 or 4.0 will be out soon then this guide is for you.
In this guide we’ll use TinyUmbrella to downgrade iPhone / iPod Touch firmware. There’s no need to edit any Hosts file that is required in other guides found all over the cloud.
iPhone 4, iPhone 3GS, iPod Touch 3G and iPod Touch 2G (MC) users MUST have SHSH blobs saved for 4.0.1/4.0/3.1.3/3.1.2/older firmware in order to downgrade.
If you’ve SHSH blobs saved on Saurik’s servers via Cydia, download them into your computer first. To do that:
* Connect your device, Fire up the TinyUmbrella (Download Link below-Step 1) and Check mark the Advanced Options.
* Select your device, firmware (the one for which you’ve SHSH saved at Cydia; 4.0, 3.1.3 or older) and Cydia as Location.
* Hit the save My SHSH button. that’s it. (check: Where it saves SHSH)
(e.g: to download 3.1.3 SHSH blobs from Cydia see the screenshot below)
NOTE: If iPhone 4, 3GS, iPod Touch 3G and iPod Touch 2G (MC) users do NOT have SHSH blobs saved for an older firmware, they can NOT downgrade unless Apple is signing the Firmware.
Steps To Downgrade iOS 4.1 to OS 4.0.1/4.0/3.1.x firmware:
Step 1 – Required Stuff:
Download TinyUmbrella and firmware 4.0.1, 4.0, 3.1.3 or 3.1.2 for iPhone 4, 3GS, 3G, iPod Touch 3G, 2G from the links below:
Rest of the steps are exactly similar to the guide posted earlier. So, follow the guide linked below and continue from Step 2:
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