Failure upgrading a rooted stock Nexus One to Android 2.2.1 I have a root Nexus one, that at one point ran a custom ROM, but now has the stock Android 2.2 release. I just got an update to 2.2.1, and it fails with:

Build : RA-nexus-v1.5.3
Finding update package...
Opening update package...
Verifying update package...
E:No signature (188 files)
E:Verification failed
Installation aborted.


What is the problem? Why does it say 1.5.3 in the build?
Installing the stock Android 2.2 FRF91 or newer unroots the phone. I had this same problem.

You can downgrade and root using the directions here: http://forum.xda-developers.com/showthread.php?t=717870