Try a different adapter. That MayFlash didn't work on my two 3-button's, and only only a select amount of my 6-button controllers (maybe a little over half of them).

@obsidianspider Lol, the only thing I can recommend is the app Babbel. But not sure if they have Japanese yet.

I have a fairly basic problem and it's the USB cable. Before I found this thread I watched a Youtube vid which advised to trim the tail. I did so but just could not get it trimmed enough to fit. I kept cutting but got scared when the black rubber started revealing clear plastic stuff. Anyway, I squeezed the whole lot in there, re-assembled and it worked somehow!!

@Dochartaigh Thanks bud, I thought I was just too stupid.