a bit more info:
what bios did you put on there i f it was a m7.bin renamed to bios.bin then it should of flashed but you won't see anything different at xbox boot screen like:
XECUTER 2 - it will still say MS if the Evox bios was used
It sounds like it flashed - if anything wasn't writable or it couldn't find the bios to flash the eject tray would open