I was trying to upgrade to 6.60 OFW (for 6.60 pro c2) from 5.00 m33-6. But i get error (The system configuration of this PSP system does not appear to be correct. The update cannot be started. Contact technical support for assistance. (DRNFFFFFFC4)" So I'm trying to reinstall 5.00 OFW for pandora battery. But it stays at 0% , and the text says Loading updater modules, then shuts down. What do I do?!?!?! EDIT: For some reason it work now. EDIT: Still when trying to update I get the error (DRNFFFFFFC4). I searched it up, and it means key 0x6 missing. How do i add it back?!?