All Credit to skatertg

Basically you can rebuild a NAND to its original state. This will be especially useful for those who do not have their original NAND and want to upgrade from XBR3 to freeboot & also if you do not know how to do this you really shouldn't have a JTAG... just my opinion haha. My friend has tested this and it worked for a Falcon board.



Things you need:
Flash360. -> [ Register or Signin to view external links. ]

Your CPU key (the one you get from Xell or Xellous not the donor's key).

To find your CPU KEY:

Have a camera ready to take a picture of the Fuse Set's that pop up briefly.
Take a picture that includes fuse set 3,4,5,and 6. These contain your CPU key.

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Take either 3 and 5 or 4 and 6. This will make up your cpu key. 3=4 5=6 So for example. I will take 3 and 5.

3= E42D681ED06A6D1C

5= 1FFD8E48C56A2058


So my CPU Key is - E42D681ED06A6D1C1FFD8E48C56A2058


Adding either one of the two will make your CPU key.


After getting your cpu key you can write your original nand image back to the board. Or go straight forward and install XBReboot or freeBOOT.
^ copy and pasted part.

A NAND that matches your motherboard type with the 7371 kernel. You don't need their CPU key, any encrypted nand image will do.

360 Flash Tool download -> [ Register or Signin to view external links. ]


Instructions:

Launch Flash360 and use it to dump your NAND.

Extract the kv.bin and config.bin with Nandpro2b with the following commands:

nandpro.exe flashdmp.bin: -r16 rawkv.bin 1 1

nandpro.exe flashdmp.bin: -r16 rawconfig.bin 3de 2

Then inject them into the donor NAND renamed "7371.bin" with the following
commands:

nandpro.exe 7371.bin: -w16 rawkv.bin 1 1

nandpro.exe 7371.bin: -w16 rawconfig.bin 3de 2

Open the orig.bin in 360 flash tool using your CPU key to make sure all the info looks correct.