Since itunes upgraded to 11.1, Apple has limited the app to not allow to brush the homemade firmware, so want to brush home-made firmware temporarily only downgrade itunes to 11.1 version, here is provided itunes 11.0.5:
Windows 32-bit: Https://secure-appldnld.apple.com/iTunes11/091-9269.20130816.Azfre/iTunesSetup.exe
Windows 64-bit: Https://secure-appldnld.apple.com/iTunes11/091-9270.20130816.Qw23e/iTunes64Setup.exe
MAC version: HTTP://APPLDNLD.APPLE.COM/ITUNES11/091-9268.20130816.BBGTR/ITUNES11.0.5.DMG
If your machine already has iTunes11.1 installed, follow these steps strictly before installing 11.0.5:
1. Uninstall Apple Mobile Device support
2. Uninstall Apple App Support
3. Uninstall itunes
4. Restart your computer
5. Choose to install the old version (32-bit/64-bit/MAC version) according to the version of your system
Reminder: If itunes reminds you that you cannot read the file itunes Library. ITL, please go to My Documents, my music, and delete the "itunes Library.itl" file under the itunes folder.
About iTunes11.1 can not brush the self-made firmware solution