Downgrade iPhone 4, 3 GS, iPad 2, iPod touch iOS 4.3.4 firmware to 4.3.3, 4.3.2, 4.3.1, 4.3

Apple just released iOS 4.3.4 fixes PDF exploit to prevent the user use Comex’s JailbreakMe 3.0 jailbreak. If you have upgraded to iOS 4.3.4 and save a lower version of SHSH blob, such as iOS 4.3.3, iOS 4.3.2, iOS 4.3 or iOS 4.2.1, all can be downgraded from iOS 4.3.4.

However, to note that this tutorial does not apply to the iPad 2 3G 4.3.4 downgrade, because there can not downgrade the baseband, if you have upgrade your iPad 2 3g to iOS 4.3.4, it can only say pity.

Degradation process:

Step 1: Download the appropriate version of IPSW firmware file you want to downgrade.

Download iOS 4.3.3

AppleTV(2G) (AppleTV2,1) 4.2.1 (8F202) 03/22/2011 16:12:01
iPad (iPad1,1) 4.3.3 (8J3) 05/04/2011 13:19:01
iPad 2,1 (iPad2,1) Wifi 4.3.3 (8J2) 05/04/2011 13:19:01
iPad 2,2 (iPad2,2) GSM 3G 4.3.3 (8J2) 05/04/2011 13:19:01
iPad 2,3 (iPad2,3) CDMA 3G 4.3.3 (8J2) 05/04/2011 13:19:01
iPhone (iPhone1,1) 3.1.3 (7E18) 04/08/2010 21:05:48
iPhone 3G (iPhone1,2) 4.2 (8C148) 11/22/2010 13:08:57
iPhone 3GS (iPhone2,1) 4.3.3 (8J2) 05/04/2011 13:19:01
iPhone 4 (iPhone3,1) 4.3.3 (8J2) 05/04/2011 13:19:01
iPhone 4 (vz) (iPhone3,3) 4.2.8 (8E401) 05/04/2011 13:19:01
iPod Touch (2G) (iPod2,1) 4.2 (8C148) 11/22/2010 13:08:57
iPod Touch (3G) (iPod3,1) 4.3.3 (8J2) 05/04/2011 13:19:01
iPod Touch (4G) (iPod4,1) 4.3.3 (8J2) 05/04/2011 13:19:01
last updated: 05/04/2011 13:20:01 EDT

Download iOS 4.3.2


AppleTV (2G) (AppleTV2,1) 4.2.1 (8F202) 03/22/2011 16:12:01
iPad (iPad1,1) 4.3.2 (8H7) 04/14/2011 13:06:02
iPad 2,1 (iPad2,1) 4.3.2 (8H7) 04/14/2011 13:06:02
iPad 2,2 (iPad2,2) 4.3.2 (8H7) 04/14/2011 13:06:02
iPad 2,3 (iPad2,3) 4.3.2 (8H8) 04/14/2011 13:06:02
iPhone (iPhone1,1) 3.1.3 (7E18) 04/08/2010 21:05:48
iPhone 3G (iPhone1,2) 4.2 (8C148) 11/22/2010 13:08:57
iPhone 3GS (iPhone2,1) 4.3.2 (8H7) 04/14/2011 13:06:02
iPhone 4 (iPhone3,1) 4.3.2 (8H7) 04/14/2011 13:06:02
iPhone 4 (vz) (iPhone3,3) 4.2.7 (8E303) 04/14/2011 13:06:02
iPod Touch (2G) (iPod2,1) 4.2 (8C148) 11/22/2010 13:08:57
iPod Touch (3G) (iPod3,1) 4.3.2 (8H7) 04/14/2011 13:06:02
iPod Touch (4G) (iPod4,1) 4.3.2 (8H7) 04/14/2011 13:06:02

Download iOS 4.3.1

Download iOS 4.3

Step 2: Download the above required files, your iPhone, iPad, or iPod touch into DFU mode, follow these steps:

Connect iPhone, iPad or iPod touch to your PC or Mac computer.
Open iTunes
Hold the top of the boot (down) button and the bottom of the Home button (circular) 10 sec.
Holding down the Home button do not release, release the boot (down) key, your computer will detect a new USB device.
Now iTunes will recognize your iPhone, iPad, or iPod touch and prompt you need to restore.
Then your device screen should be black, or that fails to enter DFU mode, required the by the above re-operation.

Step 3: Now is an important step, you had to cheat iTunes. By manually turning Apple to Saurik’s servers to achieve, practices are as follows:

Windows users use Notepad to open C:\Windows\System32\drivers\etc\hosts file (Windows 7 and Vista requires administrator privileges, you can directly use the right -> run as administrator)

Adding in the last fo Hosts file, then saving. Mac /etc/hosts (use the Finder to find).

Step 4: Running iTunes, Hold computer the Shift (Windows) on keyboard or hold down alt (Mac) and click Restore, do not click the other button! A new window will pop up and prompt to load IPSW file.

Then, select the version you want to downgrade firmware (iOS 4.3.3, 4.3.2, 4.3.1, 4.3 or 4.2.1) and selected IPSW firmware file, click Open to pay the rest of the work to iTunes.

After a few minutes iTunes will complete restore iOS firmware, then you will see the scroll bar on the device until the device automatically restart, please do not disconnect the cable, do not turn off iTunes, not to do other meaningless operation.

Sometimes iTunes will prompt an error 1013, please disregard, that is often seen in downgrade process, do not panic. After the firmware downgrade, most will enter a recovery mode.

At this time, you can use TinyUmbrella, or Fix Recovery to out of Restore Mode. The method is to download TinyUmbrella open and click Exit Recovery, after a few seconds to reboot, everything is normal. The use of Fix Recovery is basically the same as Greenpois0n jailbreak (when using need to open iTunes).

After the end, please comment out of hosts withr # sign, so you can regular use Apple’s other services.

Downgraded, you can untethered jailbreak the degraded device with jailbreak tools.

  • Victor

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