Help please...Everything was fine with my N1 before downloading FRG83D. I'm not sure if both of two parts successfully downloaded. In Settings, the build number says it's FRG83D. Some apps, games (don't save in progress games), a pop up message says "Doubletwist has stopped unexpectedly" and I must "Force Close" while I never opened the app. When I get emails, the phone plays some generic song to notify me there is email waiting. It will continue to play until I open email. It is not the ringtone I selected. Some apps I had to pay for so I don't want to delete and purchase again unless I have to. My phone contacts remained intact, but Favorites and the call log was wiped clean. Weird thing is it asked me to set up email again even though it was working. I don't believe my phone is "rooted" as I obtained my phone as part of a free promotional deal and not through a carrier, nor through Google. My carrier is ATT. Till this latest download my phone has been trouble free and great in my opinion. None of these are fatal errors, but are annoying. Is there a way to revert back to the previous build number (whatever that was)? If so, how? If I can, I'll probably be prompted of the FRG83 download and hopefully a second time it will be clean. And in the state my phone is now, should it affect the soon to be coming Gingerbread version? Any suggestions? Thanks for your assistance.