i tried to do no mod exploits with my xbox. i messed up when i tried to put evox on to my harddrive. now when i switch on my xbox i get an error 21 with or without a game in( i think i left it off for too long so now when it asking to put time there is no xbox dashboard). i was advised that exucuter chip would help me out. i have the chip now installed but i am unable to flash the bios. (the tray does not eject). can anyone help me? when i swith the xbox with the chip enabled then it does not go to cromwell it just goes to error 21 but the screen is different to the normal one. underneath is a definition table saying what the error are. please help me