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 How to Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Guide]

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PostSubject: How to Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Guide]   Mon Mar 28, 2011 5:34 am

How to Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Guide]


How to Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Guide]

Apple today has released iOS 4.3.1 for iPhone 4, 3GS, iPad 2, iPad, and
iPod touch 4G/3G. If you upgraded to iOS 4.3.1, and now you want to
downgrade back to iOS 4.3, iOS 4.2.1 or 4.1, simply follow the
instructions posted below to downgrade iOS 4.3.1 on iPhone 4, 3GS, iPod
touch, iPad 2 and iPad 1 to iOS 4.3, iOS 4.2.1, 4.1, 4.0.x.

Step 1: Download the required old ipsw firmware files. (Download links: iOS 4.3, iOS 4.2.1, iOS 4.1, iOS 4.0.2, iOS 4.0.1)

Step 2: Put your device into DFU mode (not recovery mode).

Connect your iOS device to your computer.
Turn it off.
Start iTunes.
Hold Power and Home buttons together for 10 seconds or so.
Release Power button but keep holding the Home button until your computer recognizes a new USB device.
iTunes will now recognize your iPhone, iPad or iPod touch.
Note: Your iPhone, iPad or iPod touch screen at this time should be
blank (black in color), if not, then you are most likely in Recovery
Mode, not DFU mode.

Step 3: Start iTunes, click on your iOS device icon from the sidebar in
iTunes. Now press and hold left “alt” (option) button on Mac, or Left
“Shift” button if you are on Windows on the keyboard and then click on
“Restore” (Not “Update” or “Check for Update”) button in the iTunes and
then release this button.

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[You must be registered and logged in to see this image.]

This will make iTunes prompt you to select the location for your iOS
4.3, iOS 4.2.1 or 4.1 firmware file. Select the desired ipsw file and
click on “Open” to restore your iOS device.

Now sit back and enjoy as iTunes does the rest for you. This will
involve a series of automated steps. Be patient at this stage and don’t
do anything silly. Just wait while iTunes installs the requested
firmware on your iOS device. Your device screen at this point will be
showing a progress bar indicating installation progress. Once done, it
will reboot automatically.

Now in some cases while restoring to iOS 4.3, iOS 4.2.1 or 4.1, iTunes
might throw 1013 error at you as shown in the screenshot below. This is
normal, just ignore this error as the firmware has already been
successfully installed on the device.

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[You must be registered and logged in to see this image.]

Incase of the above mentioned error, your iPhone, iPad or iPod touch
will be stuck in Recovery Mode, showing that “Connect to iTunes” screen.

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[You must be registered and logged in to see this image.]

To exit your device from Recovery Mode, download this program called
TinyUmbrella (Windows/Mac). Run it and the click on “Exit Recovery”
button. Your device will now restart normally.

STEP 4:redsn0w_win_0.9.6rc8
browse - iPhone2,1_4.1_8B117_Restore
just install ipad baseband

STEP 5 : UNLOCK WITH ULTRASN0W

ENJOY

BR
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How to Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Guide]

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