I am upgrading from my Droid 2 to a Razr Maxx. My D2 is rooted, and it's locked on 2.3.20 since I have the Updater frozen with Titanium Backup so it won't take an OTA update and lose root. After I get my new Maxx, I am selling the D2. Should I SBF it back to stock, or will a simple factory reset do the trick? Seems to me like a simple factory reset will still remove root, then format the SD card and it's a new/used phone for somebody else. Thoughts?