I can answer this from a technical standpoint, but if folks choose not to believe me; I have no way to back it up because I haven't experienced it first hand. There is no way anyone who manually updated to FRG01B with the update.zip from Google's servers to get an update notification; because there is nothing to be updated. A build is a build.... FRG01B is FRG01B, period. As long as it's a STOCK (meaning non-rooted, no build.prop edits, things like that) FRG01B system; it's going to be consistent across devices. A build cannot change mid-stream, otherwise it has to be re-built, and the build number will change. Like FRG22, for instance. It likely has very minimal changes from FRG01B, but simply because the project has to be rebuilt from the source to incorporate the changes, the build number must be different. So if you're on the official, non-rooted FRG01B - no matter HOW you got there, you will not receive the OTA notification for any reason shy of a glitch on the update server.