Well, this has been interesting. I thought my N800 had become bricked--constantly re-booting (or just hanging near the end of booting after disabling lifeguard). I had flashed it several times with different release versions, twiddled the rd and lifeguard flags. Today I decided to just try the 2008 version (after I discovered the torrent, which is MUCH faster! -- thanks whoever uploaded that), and lo-and-behold, the thing boots up, after a couple of retries! I just hope I never forget to keep the battery charged, as I still don't trust it (plus it makes funny crackling noises whenever I touch the screen--despite the audio being otherwise fine, which started shortly before the previous system failure), but I'm pretty pleased right now!