Problem upgrading N1 to Android 2.3 I have a once-rooted Nexus one. Since then I unrooted it to enable automatic upgrades, and currently have a stock 2.2.

I got the notification to upgrade my OS (to 2.3 I assume), but after my phone restarts, I am presented with the following text in the recovery screen:

Build : RA-nexus-v1.5.3
Finding update package...
Opening update package...
Verifying update package...
E:No signature (8 files)
E:Verification failed
Installation aborted.


How do I fix this?
Sounds like a bad download.  I'd delete it if you can and try again, or download and upgrade manually.  For 2.2.1, try following this post at androidandme.  If it was 2.3 you might want to wait, Google has said it wouldn't be released for the N1 till after the holidays (example) so it might have been a mistake.