Here's an unworthy translation from me. Not everything get translated though since I've only got Dingoo to tested with. It's not an accurate translation but still reasonable by its functionality because I prefer to use another wording. To access the Emulator's Menu, press the Power key after the game is loading (Select+Start was not implemented for it).
The emulator was created for Gemei x760+ but also worked on Dingoo A-320 with some limitations.
Get from the link below:
http://sharebee.com/18c82954
Also, I like to request to someone who is capable to create a "Volume/Sound Patch" to the emulator (from 84% to 20%) if it is possible. It is a little bit annoying to keep doing these steps [Start a game -> access the Menu -> Turn off sound -> access the Menu -> increase the Sound Volume] every time I'm going to use it. Or If you're a Gemei x760+ user, may I know if you could keep the Sound Volume settings. If yes, would you mind to share its created file settings?
And yes, I'm aware there's Goomba which is far better in emulating the Gbx games.