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 the Nook app including your bookmarks and other pages.
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.
No
Sync it to iTunes.
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.
Sync your iPhone to iTunes on our computer
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
Plug your iPhone into your computer and open up iTunes. Once there go under the Tab > Devices, ****'s iphone. Click it and you will see Sync in a small box at the bottom right.
There are 2 possible ways of doing this. You can either sync your iPhone Notes with iTunes then sync your other iPhone or use iCloud in ios5 to transfer the notes. Hope this helps