it will go back to factory settings....
Yes. Just sync your iPhone with your computer and download the 2.2 software. The new software should wipe out the jailbreak, so just re-install it.
you can not reverse the sync
You can sync your iPhone to iTunes to transport music, pictures, videos, etc.
You can sync your iPhone to the Nook app including your bookmarks and other pages.
you need itunes, and sync it on itunes (it says sync ) at the bottom right
No
Sync it to iTunes.
Unless that computer has all your music, you will lose all the music on your iPhone and it will be replaced with their music. So instead, if you just want their music but still keep your music, just drag the music files to your iPhone.
Sync your iPhone to iTunes on our computer
To sync your contacts back to your iPhone using MobiKin Assistant for iOS, follow these steps: Install MobiKin Assistant for iOS on your computer. Connect your iPhone to the computer via USB and trust the computer. Open MobiKin Assistant and select “Contacts.” Import contacts from your computer to your iPhone using the “Import” option. Check your iPhone to confirm the contacts are synced.
Through iTunes on your PC or Mac. In there you sync it, with your iPhone.
no, the sync just transfer the apps you have downloaded to the computer