i get this whenever i try to restore my boot files
ok, get
NxNANDManager on your PC, copy PROD.Keys from your SD card, and the backup of you NAND to a folder on your computer, try to open the backup files using NXNandManager, you need to point to path to your prod.keys file:
with nxnandmanager we can test the integrity of the backup files.
Then be sure you have your backup on the SD card on the path:
SD:/backup/[8 Character NAND id]/restore
for the restore works, and try again the restore.