(adsbygoogle = window.adsbygoogle || []).push({}); Ok you must have:
-The Nand + CPU-Key of Banned Console
-The Nand + CPU-Key of UnBanned Console
-360 Flash Tool
-NandPro

Steps:
1.(Get UnBanned KV)
-Open 360 Flash Tool
-Enter CPU-key of UnBanned Console
-Check off 1BL Option
-Open the UnBanned Consle Nand.bin
-Click Extract
-Select KeyVault
-Save it

2.(Insert UnBanned KV)
-Open 360 Flash Tool
-Enter CPU-key of Banned Console
-Check off 1BL Option
-Open the Banned Consle Nand.bin
-Click Import
-Select KeyVault (KV_dec.bin)
-Save it

3.(Flash New KV to Console)
-Place newly saved nand.bin in NandPro Folder
-Connect Banned Console to LPT
Run Commands
-NandPro Nand.bin: -r16 rawkv.bin 1 1
-NandPro Nand.bin: -r16 rawconfig.bin 3de 2
-NandPro lpt: -w16 rawkv.bin 1 1
-NandPro lpt: -w16 rawconfig.bin 3de 2
All Credit goes To Coolshimp On Se7en Sins

I have already seen this posted on this site.

The xbox which gave the cpu key and kv can play on XBL if the unbanned play ?