how do I get smb2j or the pellson rom to work on my nes classic?? Help??

Its hard to see with the lines but I'm just wonder whether its D50 or D70??https://m.youtube.com/watch?v=13E3y3Jf06s

I would probably consider that hardware modification. You're making it easier to make inputs which are therefore cheating. Honestly I wouldn't even change things because that just makes all of these rumors about people cheating and not getting real wr's