Sorry I am quite noob and not sure what is Tesla.
Anyway, I did a little digging, and one of it was to remove sigpatches. So what I did was I delete patches.ini, kipef, basically all sigpatches file. Yet when I reboot, I can still play all games, except for Xenoblade and a few others (Dragon Quest HD).
You mention latest firmware, does the stock firmware matter? I am currently on 15.0.1 | AMS 1.8.0|E.
Is this the latest? Do I need to be on 19.0.0? I dont really think it matters because I can play lots of other games just fine, one of it is Romancing Saga 2 (Oct 24 release).