Since I can't open my mp3, I opened my "old" mp4, which is also from Zipy (the brand was called e-zipy by then)
I found the following in the green board:
0638
MD660IFOD-PCB-V1.2A BW
The MD660IFOD part was the only thing I could find on a google search.
There was also this written in one of the two black chips (or whatever they are):
ALi DRE
M5661R B1
0634 TG05
Y615211000GA
It had a round green sticker saying ROHS. Don't know whether this is useful.
I couldn't read the other chip since I couldn't remove the sticker it had.
So, what does this tell me?