There exists a sync issue with recently released iTunes 9.1 for iPhones and iPod Touches that are jailbroken with Blackra1n. ih8snow has just released ‘blackbreeze’ that fixes this issue.

This is how to do it:

• Download blackbreeze.
• Download blackra1n.
• Place both .exe files in a single folder on your desktop.
• After connecting your iPhone with PC, Run blackbreeze and click “Fix my ra1n!” button.
• You will be ask for blackra1n .exe file. Browse it and click open.
• It will create the blackra1n-fixed.exe file on the desktop.
• Run blackra1n-fixed.exe file and it will jailbreak your iPhone if it’s untethered or will start the device if its tethered.

Done

[via ihackintosh]