Sorry for the long delayed answer.
I managed to redump Batman J's CHR.
Since I have done 3 times and got the same results, I'll assume it's a good dump.
I choose to name the ROM as the chip, to avoid confusion (at last to me
The video is going to be delayed a bit more, since I'm having a huge fight with my capture card!! :-b
I have found another pirate game board. It was in very bad condition.
I disassembled, cleaned and dumped it, but it didn't work on any emulator I have tried. Mostly because the PRG ROM is bad, but it can be another modified mapper.
The original game is a MMC1 game. It's using a supposedly clone, labelled 9121, but it has some weird connections to the NES' CIC.
I'll reassemble it. If it works, probably it's a custom or modified mapper, or I did another bad dump
Think it's better to create a new thread to discuss it...
Again, thanks to everybody, I'm having fun and learning a lot in the process!!