As the title states, I have a jailbroken iPhone 4 (5.1.1) and I no longer have access to the computer that I used to sync with the phone. When I try to connect it to my new computer, I get the "Do you want to erase this iPhone and sync with this iTunes library?" prompt.

I've found some tutorials on manually managing music on your iPhone across multiple computers, but in order to do that, you need access to the main computer that the iPhone is authorized/connected to.

I don't want to lose my contacts/jailbreak/apps, etc. Is there any way to manually manage the content of this iPhone without erasing everything? Any help would be much appreciated - thanks!