Here you go Martinchris, made it just for you...
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firmtool v1.0 by caster420
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PURPOSE:
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Firmtool was created to allow users to easily create Samsung/BenQ
Xtreme/iXtreme firmware patched with the correct information from
their BenQ/Hitachi/Samsung original firmware.
FEATURES:
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Firmtool supports original firmware from all drives currently
shipped with an Xbox 360 console. It will detect the firmware
version, locate, check and copy the key, copy the version strings
if different from the hacked firmware (aka spoofing), and copy the
drive serial (for BenQ firmware only).
USAGE:
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Simply place your original firmware file (orig.bin) and the hacked
firmware (hacked.bin) file in a directory with firmtool.exe. If in
windows, open a command prompt window and goto the chosen directory.
Then type:
firmtool orig.bin hacked.bin
If firmtool completes without any errors or warnings, then the
hacked firmware is ready to be flashed to your dvd-rom.
*** Note: Filenames are not fixed but must conform to the 8.3 dos
standard.
KNOWN ISSUES:
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- When firmtool is too deeply embeded in a directory, it will fail
to execute. Simply move it to a directory located closer to the
root of your filesystem and it will execute properly.
CONTACT ME:
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Send me a PM on xbox-scene, xboxhacker, 360mods.net, or on EFnet.
THANKS TO:
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commodore4eva, carranzafp, garyOPA, Iriez, momdad, Textbook, Lahey,
bigd23, modfreakz, uberfry