QUOTE(FasterBlaster @ Aug 22 2008, 06:52 AM)
I may be on to something... I just tried using slayers to completely rebuild my HD and when I first tried out the MS dash and XBMC they both worked fine, but when I changed the system settings so I could FTP and then rebooted, I get error 21 again. Could my xbox be connecting to live (its plugged into my router) and patching my original dash? If so, how could I fix this?
Use a softmod like Krayzie's Ndure (gamesave style) or Kingroach Ndure with shadowC protection to prevent dash updates.