I'm having similar problems. Does the ROM need to be placed in a specific file? I downloaded bin file for the PSX BIOS. But it opens it and I just get a black screen.
Edit:
Okay, here are instructions courtesy of (guess who?!) XDA:
Step by step tutorial to getting psx4droid to work... - xda-developers
Worked like a charm for me. Keep in mind that the conversions will take some time (FFVII Disc 1 took me about 20 mins between unecm and copy/paste to sd card). But the ROM works fairly flawlessly. Be sure to rename them after you UNECM as they will get named data.bin. When overclocked, only the sound seems a bit off, but touchscreen response and video speed runs perfect so far.
Going to do some digging for how to setup Wiimote compatibility. Feel free to chime in if you are aware of how to set this up. Thanks!