I didn't do anything to the board. I got it from sheep_nova on ebay this way with those pins modified and was told it was multi ready. I was under the impression the blob joining pins 44-46 was just connecting them to ground. Is that wrong and should they be desoldered and each pin returned to their original traces?Are you sure that the mod made to that C board has been undone? I see some traces cut and some soldering blob around pin 45 from main chip in C board.
Actually the only reason to remove the battery is any risk of leak. The battery being present or not means nothing to the capability of the multi re-write or not the key.No, the Multi writes the decryption keys to the C board every time you power up or change games. If the battery is present then the C board only retains one key and it gets in the way of the Multi changing the keys.
Actually, it runs anything but it has to be on the original Capcom ROM format. The team converted a couple of hacks/bootlegs to the format the CPS1 multi needs. Some bootlegs are not actually CPS1 hardware but custom pirate boards with extra code added to the ROMs. Those won't run on the multi indeed.I sent you a PM, but be aware that the CPS1 Multi only runs the original Capcom ROMs.