I confirm 3206 modchip is not compatible with fdsstick read/write.
When it is develop, fdsstick haven’t appear. So, I can’t know that.
It is working good except fdsstick. Like Copy Master 1.1, Disk Hacker else.
Also, it can work with any fds game with save function like Zelda.

I’m finding a way to make it compatible with fdsstick. But need some times.
I will check what different with Copy Master and fdsstick read/write.
Hope will fix soon. Sorry.