Ehhh, I can help you with resetting your hardware, but I've never had to backup codelists so I don't actually know that much. I'm kind of useless, tbqh To reset the hardware you right click at the top of the window and go to "About Action Replay DS Code Manager". There should be a "Reset Hardware" button there. It'll delete all of your codes, note, so until you know how to back them up I wouldn't advise it. Unless you just don't care, in which case be my guest I suppose.
After tinkering with a money code, that also doesn't work. I have the feeling that the entire thing isn't working, actually >.> So, like, is this a problem on my end? Anyone else having trouble out of it? Anyone? Bueller?