Your matrix needs to be in mode 3 for onboard flashing, you will no you are in mode 3 when the led light on your chip blinks orange. Check your manual for verification. You will need a bios file in .bin format (ex M7.bin) and it is to be 256KB in size. I recommend the Evox M7 bios, you can get it at #xbins on efnet (Mirc) You need to ftp this bin (bios) file to your xbox and put it in the bios folder that you created when you first installed your chip. Then you need to go to your evox setting menu and select the flash bios command. From there you will select the bios that you want to flash from the pull down list and follow the instructions. Make sure that you are fully aware of how to do this as if you mess it up your xbox might not work right.