We couldn't update the system reserved partition

Usually, this kind of error occurs because the system reserved partition (where boot configuration data is stored) is too small or needs to be updated to accommodate the new build. Sometimes, the update process just assumes everything is fine without letting you know if, say, there’s not enough space or if there's a configuration issue. The whole "screen won't help" thing can be really annoying when you're just trying to get everything up to date.