if it is a rock chip then ASF will not work, it needs to be in AVI(xvid) format, in fact it is a rockchip and your seller knows squat!!
try the following program
http://www.mympxplayer.org/tool-vidr...ter-df821.html
your player needs
AVI (xvid)
220x176
MP2 audio
and if you have any problems with the player then send it back and come here for advice on a better player for less money!!!