http://www.ozxchip.c...ash_content.htm theres everything you need to know.
How to use OzXFlash
Step 1 - Creating the OzXFlash CD
(This step can be avoided by purchasing the OzXFlash CD from this website)
Download the OzXFlash CD from the downloads section of this website and using WinZIP or any compatible extraction tool extract the ozxflashcd.iso file.
Using your CD Burner software burn the ISO image file in UDF format in Disc-at-once mode and ensure the CD is finalized. We recommend ahead Nero.
Your OzXFlash CD should now be ready for use!
Step 2 - Creating the Bios CD
Ensure that the bios file you wish to use is a 256k bios file.
Make a copy of the bios file you wish to use and rename this copy to bios.bin
Burn the bios.bin file onto a CD.
(If you have trouble reading this CD in your XBox
add a file of several megabytes in size to the CD)
Step 3 - Running OzXFlash
Turn your XBox console ON and then follow the instructions that are displayed on screen.
You will notice that the OzXFlash contains many pauses during its operation, this is by design and is to allow the DVD-Rom drive to mount the CD correctly as the XBox's DVD-Rom drives are very fussy when it comes to media compatibility.
When the flashing procedure is complete the DVD-Rom tray will eject, remove the CD from the tray and the console will shutdown.
IMPORTANT NOTE: All Consoles should have the cover installed when booting Cromwell to ensure air flow is maintained. Boot problems and video fragmentation have been identified when the console heats up if the cover is not fitted!
Theres not much more to say.