Hey I got the flipper in large part to replace a few of my Access cards, but unfortunately, it cannot support my 2 bus cards (the Montreal system is stupid)
the cards use NFC-B and I know they aren’t currently supported but I think it would be awesome to have them!
Now I don’t know much about NFC in general but here’s what I do know about the cards:
they seem to be based on the ATMEL 8820 series controller and the NFC TagInfo app identifies the OPUS card as ISO 14443-B type.
according to an online user, OPUS cards use OTP bits and so any attempt to scan a card with initial content in RW area (pages 4-15) with non-zero OTP area results in ERROR 200 and the card gets locked with all lock bits (becomes entirely read-only).
I personally don’t need to rewrite these cards, just need to emulate them for the readers but hey, figured I would add my findings.
Hoping this will get added eventually as it would help reduce the number of cards I need to carry on my person, Thanks!
(do let me know if you need more info or anything of the like)