Ipod Touch Firmware Downgrade

I am running itunes on windows xp and i am trying to downgrade my first generation ipod touch, right now it is running firmware 3.1.2. However, when i put it in DFU mode and click (shift)+(restore) it extracts the software successfully but then says "This ipod cannot be updated, an unknown error has occurred [20]"
Help Please
Thanks

Iphone 1gen, Firmware 3.1.2, Windows XP

Posted on Oct 10, 2009 1:32 AM

Reply
10 replies

Oct 10, 2009 2:58 PM in response to k9thebeast

That would mean that you are not in the correct (DFU) mode. Try this...

The Roll Back Process:
(1) Locate the Home and Power buttons on your iDevice. The Home button is the round button below the screen; the Power button is the rectangular button located on top of your iDevice.
(2) Plug your iDevice into your computer.
(3) If you can’t count well in you head, look at a clock that displays the seconds because the timing of these steps is very important.
(4) Press and hold the Home and Power buttons for 10 seconds. The screen should cut off at around 8 seconds
(5) While still holding the Home button, release the Power button. Continue holding the home button for about 15 seconds. The screen will remain off and the iDevice will look unchanged, but, if you’re on Windows, you will hear the connected hardware sound; if you're on a Mac, iTunes will open and tell you that your iDevice is connected in “Recovery” mode. (the ipod screen is blank...dark)

(6) Use the alt/option key PLUS clicking on restore to select the firmware you wish to roll back to. Personally, I suggest 2.2.1 as that appears to be the most reliable.

Oct 11, 2009 11:57 PM in response to k9thebeast

theres a complicated process to rollback from the 3.1 softwares because it came out to solely stop Jailbreaking. Apple specifically designed it to NOT rollback.

-Download Firmware 3.0 (for your device)
-Go to C:\Documents and Settings\Application Data\Apple Computer\iTunes\iPod Software Updates (files are hidden, so you need to view hidden files)
-Back up files in the directory
-Delete all files
-Paste your 3.0 firmware into the software updates folder
-Rename it to the exact name of the 3.1.1 firmware (iPod1,1 3.1.1_7C145Restore.ipsw)
-Put ipod in DFU mode
DFU MODE- press the power and home buttons for 5 seconds, (ipod powers off) release power button but hold home button for 20-30 seconds, until your computer beeps.
- In itunes, it will detect an ipod in recovery mode.
-Shift click restore and use your renamed firmware and update.
For a 2nd gen, its the same routine, just make sure you have the correct image file for your unit.

Theres how its done, a little complicated, if you get lost ill try and walk you through it.

Oct 12, 2009 10:08 PM in response to k9thebeast

3.0 seems like a very solid firmware.... But i guess you have your own reasons for wanting 2.2.1 back

Connect the iPod to iTunes, wait for the conenction, and then Uncheck "Open iTunes on iPod Connect".

Close iTunes, Disconnect iPod.

Go to Finder>USER_NAME>Library>iTunes> and Delete "Device Support".

Make sure the Trash is empty, and connect the iPod. iTunes should not open.

Continue to put the device in DFU mode, wait for iTunes to detect it.

Click Restore, or Option+Restore and choose 2.2.1.

Nov 8, 2009 3:34 PM in response to k9thebeast

I just got the 3.2.1 firmware upgrade a couple of weeks ago and it will not work on my 09 Acura TL. I checked some acura websites and apparently this firmware is incompatible with most Honda products.I need to backtrack to firmware 3.0 on my ipod. Trouble is, can't find the firmware listed and trying to figure out how to backtrack to it.

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Ipod Touch Firmware Downgrade

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