The world's first "unhackable" product is now one step closer to being cracked...

If you're brave enough to flash your 360, this is for you.

The following is from a post at xboxhacker.net.

The original post can be found here

14 May 2006

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Xtreme firmware for TS-H943 Xbox 360
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Here it is, the long awaited World first Xbox 360 backup firmware modification to boot all game backups!

LINK REMOVED

Features
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Boots all Xtreme Xbox 360 backups
Boots all Xtreme Xbox 1 backups
Boots all Xbox 360 originals
Boots all Xbox 1 originals on Xbox 360
Xtreme0800 extraction firmware enables drive to function natively under Windows without any hardware conversion/adaptors
Use on Xbox Live at own risk

Technical details
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Reads Xbox 360 security sector from PSN 04FB1F (Layer 0)
Reads Xbox 1 security sector from PSN 605FF (Layer 0)
Security sector must be extrated using Xtreme0800 360 firmware for Xbox360 games and Xbox 1 games
Will not boot Xbox 1 backups made with Xbox1 605b 0800 firmware (maybe in future release)

Flashing your drive
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Advisable to make a backup of your dvd drive firmware first.("mtkflash r /m orig.bin")
Please make sure you hexedit the Xtreme.bin firmware (Not Xtrm0800.bin firmware) to include your dvd drive key from your original firmware (usually at $4000-4200).
Plug SATA cable from DVD drive to PC. Power cable drive still connected to Xbox 360
Power on Xbox 360
Power on PC
Boot with standard dos boot disk with included mtkflash utility
Run "mtkflash w /m firmwarename.bin" with relevant firmware file (Xtreme.bin for running backups or Xtrm0800.bin for security sector extraction)

Extracting Security Sector
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Ensure DVD drive has been flashed with Xtrm0800.bin firmware. Drive can now work under Windows.
Insert original game disk into drive and wait for windows to detect disk change
Run DVDinfoPro
Enter the following four custom cdb commands:

AD 00 FF 02 FD FF FE 00 08 00 01 C0
AD 00 FF 02 FD FF FE 00 08 00 03 C0
AD 00 FF 02 FD FF FE 00 08 00 05 C0
AD 00 FF 02 FD FF FE 00 08 00 07 C0

Then save hexadecimal display as bin file as SS.bin

Creating a game backup
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Ensure DVD drive has been flashed with Xtrm0800.bin firmware. Drive can now work under Windows.
Extract Isobuilder.rar
Insert original game disk into drive and wait for windows to detect disk change
Run DVDinfoPro
Enter the following custom cdb command to unlock drive: (game data visable)

FF 08 01 01

Run Isobuster
Right click on DVD and select Extract From-To
Click Length and enter number of LBAs as follows:

Xbox 1 Original Number of LBA to read 3431264 decimal
or
Xbox 360 Original Number of LBA to read 3567872 decimal
Select User Data (2048 bytes/block)
Click Start Extraction
Enter filename as game.iso and click Save
Upon read error dialogue box choose fill with blank zeros for sector and select use this selection for all errors
Copy game.iso and ss.bin to the relevent isobuilder directory (Depending on Xbox 360 or Xbox 1 game)
Run build360.bat (Xbox 360 game) or build.bat (xbox 1 game)
Ensure your burner will set the booktype of DVD+R DL to DVDRom
Burn with CloneCd and choose the image.dvd file

Thanks to everyone at Xboxhacker.net for all their discussions. Now you guys will have to get homebrew running.
Next on the list will be the PS3 and this one will be done much quicker (once it comes out!)

Commodore4Eva