fix error 20 from itunes attempting downgrade firmware 2.0 to 1.1.4

  • Posted at 2008/07/12 17:48
  • Filed under 无分类
fix error 20 from itunes attempting downgrade firmware 2.0 to 1.1.4

The reason why people are getting error 20 is because the driver differential between itunes version 7.7 and below. And through normal uninstall/install, the itunes installer will not replace the drivers.

so basically the solution is pretty easy, and version 7.5 is not a must, you can use 7.6 also.

below I have download links of 7.6 from apple. the second one is for 64bit os users.

http://appldnld.apple.com.edgesuite.net/content.info.apple.com/iTunes7/Win/061-4268.20080221.Tnz76/iTunesSetup.exe

http://appldnld.apple.com.edgesuite.net/content.info.apple.com/iTunes7/Win/061-3987.20080115.3D5gF/iTunes64Setup.exe

1. from control panel -- > add/remove programs, you like to remove "Apple Mobile Device Support"

2. install winrar, and extract the iTunesSetup.exe or iTunes64Setup.exe that you download before. of course, you have to pick the right one for your current OS.

3. there is a file called "AppleMobileDeviceSupport.msi" this is the driver package for your iTunes that will work for 1.1.4 firmware DFU Mode.

rest is very easy, just follow _BigBoss_'s downgrade guide :  http://sleepers.net/news/?page_id=216

Posted by Daddy

2008/07/12 17:48 2008/07/12 17:48
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  1. shortie 2008/07/20 07:50 # M/D Reply Permalink

    hi, i'm using mac. Any solution? pleaseee.... thanks

  2. crump 2008/07/22 09:00 # M/D Reply Permalink

    yes of course

    Load up Terminal and type the following:
    killall iTunesHelper
    sudo -s
    rm -r /Applications/iTunes.app
    rm -r /Library/Receipts/iTunesX.pkg
    rm ~/Library/Preferences/com.apple.iTunes*
    rm -r /Applications/iTunes.app
    rm -r /Library/Receipts/iTunesX.pkg
    rm ~/Library/Preferences/com.apple.iTunes*
    rm -r /System/Library/PrivateFrameworks/MobileDevice.framework

    and after that you could install whatever itunes versions you like.

  3. alex 2008/07/22 11:06 # M/D Reply Permalink

    Hi there!!!

    I had my 1.1.4 firmware unlocked phone tried to upgrade to v2.0 and got it locked. The phone shows the restore mode and I wanna get back to my old 1.1.4. I tried to download the itunes 7.6 (after uninstalling the itunes 7.7 from the system) but can't open itunes as it shows an "itunes library.dl file can't be opened as the file was created in new version of itunes" ANy help as to how do I restor back to v1.1.4??

    1. Daddy 2008/07/24 19:22 # M/D Permalink

      hi Alex.
      I assume that you already heard of the new winpwn is out for windows users, so I suggest you to upgrade to itunes version 7.7 and upgrade your phone to 2.0 to take full advantage of it. I'm using 2.0 with Cydia packaging manager and also the App Store. 2.0 is amazing.

  4. chefchris 2008/07/31 06:38 # M/D Reply Permalink

    hi i recently upgraded to 2.0 and relocked my phone, i then uninstalled my itunes and reinstalled 7.6 to downgrade my iphone to version 1.1.4 but now itunes does not pick up the phone, what next

    please help

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