5V supply help needed

calling it here for the night. I tried to figure out teh three chips on the top side of the anker, two of them at TI LM358 power amplifiers, the last one is a 20 pin microcontroller stamped ABOV 81f4204w. I've searched my ass off for the last 3 hours, I found it listed as mc81f4204w, but i still have no idea what it actually is, there is also a 5pin header directly beneath it, i'm assuming for programming it. If anyone can help me out, i'd really appreciate it