Just few minutes ago Apple released iOS 4.3.4 for iPhone, iPad 1, 2 and iPod Touch devices (3G & 4G) in order to fix the hole present in Safari that allowed hackers to inject jailbreaking data into device in the form of JailbreakMe 3.0. Though MuscleNerd has advised all those users who want to keep their idevices jailbreakable not to upgrade their idevices to this latest release but if anyone has installed iOS 43.4 intentionally or unintentionally, he can use this step by step guide to downgrade to iOS 4.3.3.
Note: Downgrade process will work only if you have already saved SHSH blobs for the iOS firmware to which you are downgrading. If you are still on iOS 4.3.3, we recommend you to save the SHSH blobs on Cydia and on your local hard-drive using the TinyUmbrella before Apple closes the signing window for iOS 4.3.3.
Downgrade iOS 4.3.1 to iOS 4.3 or iOS 4.2.1 Guide:
Step 1: Download the iOS firmware file (stock iPSW) to which you wish to go back. [Direct download links for iOS 4.3, iOS 4.2.1 and iOS 4.3.3]
Step 2: Open”Hosts” file in NotePad from this location in Windows OS: C:/WINDOWS/system32/drivers/etc
If you are Mac user, navigate to GO -> Go to Folder and enter the path “/etc” and open the file “hosts” with TextEdit.
Step 3: Now add the following hostname at the end of the file as shown in the screenshot below. Save the file.
Step 4: Open iTunes and connect your device with the PC via USB cable and put your device into DFU mode. Here is how you can get DFU mode on your phone.
- Turn off your phone.
- Now press Power button and as soon as you seen Apple Logo, press Home button while keeping pressed Power button too.
- Keep holding down both button for about 10 seconds.
- After 10 sec, release Power button but keep holding Home button until iTunes recognizes your iPhone. You should keep the PC volume high to hear New Device Detection sound.
- Let go the Home button. At this point your iPhone screen should be blank (black in color).
Step 5: From the iTunes sidebar select your device. Now press the “alt” (option) button on Mac or left “Shift” button if you are on Win and then click on “Restore” button in the iTunes.
This will make iTunes prompt you to select the location for iOS 4.3.3, iOS 4.3.2 or iOS 4.3.1 you downloaded in step 1.
Now sit back and let iTunes restore iOS 4.3.3 on your iPhone/iPad/iPod Touch. During the restore process you may see unknown error messages (1013, 1004 etc), just ignore these errors. If you sill get such error, retry after putting your device into Pwned DFU mode.
At this point your iPhone may be stuck in recovery mode, showing that “Connect to iTunes” screen. To get rid of this recovery mode, download TinyUmbrella and click on “Exit Recovery” option.
That’s all. Now you can use JailbreakMe 3.0 to jailbreak your iPhone, iPad or iPod Touch running on iOS 4.3.3.