How to Downgrade iOS 4.3.3 to 4.3.2, 4.3.1, 4.3, 4.2.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch

The just released iOS 4.3.3 firmware update for iPhone 4 has been successfully jailbroken using custom PwnageTool bundles. The jailbreak though is tethered only for now, which means that you will have to boot it into jailbroken state every time you reboot.

Cydia running on iOS 4.3.3, iPhone 4 (GSM)

Even though you can jailbreak iOS 4.3.3 with Redsn0w (tethered for now), but by using this PwnageTool bundle, you can preserve the old baseband so that your iPhone can be unlocked using Ultrasn0w. Also, an untethered jailbreak for iOS 4.3.3 is said to be on its way too!

Simply follow the instructions posted below to jailbreak iOS 4.3.3 on iPhone 4 using a combination of our very own PwnageTool bundle for iPhone 4, PwnageTool 4.3.2, and tetheredboot utility.

Here’s what you will need:

• PwnageTool 4.3.2
• iOS 4.3.3 firmware
• iTunes 10.2.2
• Mac OS X
• PwnageTool bundle for iOS 4.3.3 
• tetheredboot utility

Note:

• There is no unlock for the new baseband on iOS 4.3.3. If your iPhone relies on a carrier unlock, DO NOT update to stock iOS 4.3.3.
• iPad 2 users on iOS 4.3 should stay away from iOS 4.3.3 until further confirmation.
• Cydia is fully working on iOS 4.3.3
• It is a semi-tethered jailbreak.
• Your baseband will not be upgraded during restore process.
• Hacktivation is supported.

Modifying PwnageTool

Step 1: Download PwnageTool bundle for your version of iOS device. Extract the .zip folder, in there you will find a .bundle file, for this guide, we are using iPhone 4 bundleiPhone3,1_4.3.3_8J2.bundle. Move this file to your desktop.

Step 2: Download PwnageTool 4.3.2 and copy it to /Applications directory. Right click, and then click on “Show Package Contents” as shown in the screenshot below.

continue reading

Jailbreak iOS 4.2.1 GM on iPhone 4, 3GS, 3G and iPod touch 4G, 3G

Now you can use Redsn0w 0.9.6b2 to jailbreak all these iOS devices.
For now you can install jailbroken-apps via SSH - until we got the new Cydia version - as you have full root access on your iOS device.

STEP 1: Download redsn0w 0.9.6b2,  iOS 4.2.1 GM and iOS 4.1 final version for iPhone 4, 3GS, 3G, iPod touch 4G, 3G (download links at the end).

STEP 2: Update to 4.2.1 GM firmware using the IPSW file you just downloaded via iTunes.

STEP 3: Launch Redsn0w 0.9.6b2,  and Browse for iOS 4.1 firmware final version (NOT iOS 4.2.1 GM). 

STEP 4: Select "Install Cydia" and click on Next

STEP 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

STEP 6: At this stage you will need to put your iPhone in DFU mode by holding “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

STEP 7: You will Get a Jailbroken Device on the latest iOS 4.2.1 GM as soon as the process ends.
source:
http://www.limera1n.cc