I just tested this on a xenon xbr with a totally random xenon nand and it worked.
Things you need:
1) Your XBR nand dumped(you can easily get this with 360Flash)
2) Your CPU key attained from booting Xellous/Xell
3) A NAND that matches your motherboard type. (you dont need their cpu key nothing, just a basic nand image will do)
Take your xbr dumped from 360Flash and extract the kv and config as you normally would with nandpro2b. I called my XBR image "updflash.bin"
Nandpro2b: Click Here
nandpro updflash.bin: -r16 rawkv.bin 1 1
nandpro updflash.bin: -r16 rawconfig.bin 3de 2
Then Just inject thiem into the original nand dump. I called it "orig.bin"
nandpro orig.bin: -w16 rawkv.bin 1 1
nandpro orig.bin: -w16 rawconfig.bin 3de 2
Open the orig.bin in 360 flash tool using your CPU key:
360 Flash Tool:Click Here
Make sure all the info looks correct, and it should if you followed this tutorial.
You should now have an original copy of your nand enjoy