Most importantly, do not attempt to set anything up, or even apply a backup from 2.x. A reset device is best upgraded to latest before doing anything with it. Just in case, enable developer-mode once you got it upgraded to 1.0.2.5. It was recognized to be smoother on upgrades when you reboot after each upgrade after it has settled the current upgrade, eg CPU usage is back to normal shows it has done everything. (some upgrades download faster than your device needs to settle in the current upgrade)