BD-R on DECR-1000A OFW

I got one of those units recently and was surprised to find a disc in the drive, which seems to be a prototype of Book of Potions (Europe).

Anyway it's burned on BD-R and somehow it works on OFW (version 4.41, mind that this is DECR). However retail game backups and homebrew on BD-R (which work on CFW with recent enough Cobra payload) don't work.

I assume there's probably some flag that designates the copy as a master and allows it to run but I'm not sure how to find it. Anyone wants to...

BD-R on DECR-1000A OFW