Need help to unroot, downgrade, then get OTA update.

[mpridmore]

My Bionic is rooted and running the .232 leak, which has been great. To get the upgrade, though, I need to unroot, then downgrade, then get the OTA update to .247.

Question about BACKING UP: Is there a non-root backup app that will back up apps, data, contacts, and such? After I go back to stock with the OTA update, I'm assuming Titanium Backup won't work.

1. How do I unroot? Do I just use RSDLite to flash the .905 (or .902?) to the phone's SD card and then install it from recovery mode?
2. After I runroot, can I get the OTA update from .905, or do I need to go back to .902?
3. Is the official OTA update rootable?

Thanks for all the help and guidance, folks!

[Stinson317]

Google house of bionic (hob). It is the best tool I've ever used for moving between different versions. It is all but fool proof. Just follow the instructions.