How to change the DVDkey in the Xbox360 motherboard

You need this hardware:
- xbox 360 4532 or 4548
- Infectus modchip
- PC with XP

You need this software :
- the Infectus Programmer v.0.0.3.4d
- a hexadecimal editor (hex workshop)
- Flashtool 0.81
- the NAND.bin file
- the 1BL.bin file
- the FUSES.bin file

To change the dvdkey, we patch the NAND.bin with the KV.bin file (keyvault).
To have the KV.bin file, you need the CPUkey, Flashtool and the NAND.bin.
To patch the NAND.bin by the KV.bin files, you need the 1BLkey.

1) How to get the CPUkey :
The CPUkey is in the FUSES.txt file.
Open the FUSES.txt file with a text editor, delete all lines except the lines 3 and 5 (or 4 and 6).
CPUkey = line 3 + line 5
Save in CPUkey.txt.

2) How to have the 1BLkey :
The 1BLkey is in the 1BL.bin file.
Open the 1BL.bin file with your hexadecimal editor and Goto offset 5878
The key begin is in 5878 and ends in 5887.
Copy the 32 digits in 1BLkey.txt

3) /Keyvault creation, KV.bin : (diagram 1)
Now, you are 2 keys and the NAND.bin file.
- Open Flashtool.
- Select Keys
- Open near the 1BLkey.txt and CPUkey.txt.
- Copy/Paste the keys and OK
Press Dump Files and select the NAND.bin file.
- Press Extract, select Key Vault and OK. Save.

The KV.bin is created (16 368 octets).

4) KV.bin modification :
The DVDkey is in the KV.BIN.
- Open KV.BIN file with your hexadecimal editor and Goto offset F0
The key begin is in F0 and the end in FF

- Change the DVDkey.

- Save the change.

Now the KV.bin file is ready for the nand.bin patch.

5) NAND.bin patch : (diagram 2)
- Open Flashtool :
- Choose Patch
- Cross Patch Keyvault and press Browse...
- Choose the KV.bin file and OK. Save the new NAND in NAND2.bin.

It's OK. The nand is patched and the name is NAND2.bin.

6) Flash the motherboard :

- Launch the Infectus Programmer.
- Connect the USB cable to the Infectus
- In Flash Command select Erase.
- In Flash Command select Blank Check.
- In Flash Command select Write. Choose the NAND2.bin file and Open.
- Disconnect the Infectus.
- Close the programmer.

Full Detail: http://forums.xbox-scene.com/index.php?showtopic=621053