In this guide you’ll learn how to downgrade iOS 4.1 to 4.0 / 3.1.3 / 3.1.2 on iPhone 4, 3GS, 3G and iPod Touch 3G, 2G. Follow the Instruction below to downgrade iPhone/iPod Touch iOS 4.1 to 4.0/3.1.3/3.1.2 firmware.
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. We are going to setup downgrade server the TinyUmbrella way: with a single click.
IMPORTANT:
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.
How to: Save SHSH blobs for iPhone, iPod Touch and iPad
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)
Click to enlarge.
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.
Downgrade iOS 4.1 to OS 4.0.1/4.0/3.1.x firmware
*** Read the whole process first and then try.***
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:
- Download iOS 4.0.1
- Download iOS 4.0
- Download iOS 3.1.3
- Download OS 3.1.2
- Download TinyUmbrella (Needed for iPhone 3GS, iPod Touch 3G, 2G-MC only.)
Rest of the steps are exactly similar to the guide posted earlier. So, follow the guide linked below and continue from Step 2:
Now you can jailbreak iPhone OS 3.1.3 with Spirit, PwnageTool, Sn0wBreeze, RedSn0w and custom 3.1.3. To jailbreak iPhone OS 3.1.2 you can use RedSn0w, Sn0wBreeze, BlackRa1n, PwnageTool and custom 3.1.2.
You can always unlock iOS 4, 3.1.2, 3.1.3 on baseband 05.12.01, Baseband 05.13.04 and 05.11.07 using UltraSn0w 0.93.
Updates: