Great work

Readme says:
- Buttons SELECT+B: Enter/Exit Volume menu.
- Buttons SELECT+X: Enter/Exit MAME menu
But it's the opposite.
Also maybe you could use the B button to go back (since B is used to go back in all other dingoo menus). For example, B to go back in launcer instead of X and B to close mame menus and volume etc would be great.
If you hold A (or B) to long in menus, you'll enter two of them... if you hold it too long when it says Press A Key you might launch a game accidently.
I'll see if I can find anything more. The games I've tried so far have worked great.