I have that same MP4 player and it came with a driver disk.
I zipped and uploaded the files to
http://www.datawhorehouse.com/mp4player/mp4firmware.zip
Good luck. I have the 2GB version and the firmware doesn't work. When connecting it via USB, my computer reports it as Ankya PMP2501
The screen shows BIOS PMP MLC V2.1.6
I did a low level format and then copied all the files into the 16MB folder. However when restarting, it doesn't boot back into the menu. Instead, I see some garbage graphics on the top 1/4 of the screen and it makes beeping noises. I wonder if I need the 2501 firmware???
~Rolan