I bought a Tekken 6 player card from Arcade Spare Parts. I put it in an arcade (6br) in Korea and it says card reading failed. I also connected the card reader I bought from that mall to my system 357c and it doesn't work.
If I remember correctly, Korea's 6BR runs online, the card just records the login account, and all information is saved on the server, similar to Tekken TT2 and 7.