Device: Nexus One Carrier: STC Country / Language: Saudi Arabia / English OS : Android 2.2.1 build number: FRG83D I have a problem with updating my Nexus One to GB, I still haven't gotten a system update alert. So I tried to upgrade it manually, but it wasn't working either. I already did a factory data reset, but it is still not working. This is what it said when I clicked "apply sdcard:update.zip": -- Install from sdcard... Finding update package... Opening update package... Verifying update package... E:failed to verify whole-file signature E: signature verification failed Installation aborted Can somebody please help me with this, I tried everything I could.