ususally, xbox's don't get bricked, they have onboard firmware, and the firmware is not accessable externally, if you are trying to remove the NXE, it isn't possible, if you want to try, you may be able to trick the console into downgrading the firmware, by putting a firmware update file on the hard drive via special adaptor, but annother thing to know is that the xbox dvd drives are keyed to the motherboard that they shipped with, so if you get a new logic board, make sure that it comes with a DVD Drive