please have a look at your firmware version in settings.
if it is 9.x.xx or something like that, then you cant mod it as s1res which supports that firmware hasnt been released yet.
if it is 3.5.xx, you can mod it. have a look here -
http://www.mympxplayer.org/how-to-mo...ng-vt1719.html
if yours is 9.x.xx and you want to change the theme bad, you can have a look here
http://www.mympxplayer.org/yes-9048-...ed-vt3573.html
for other information have a look at the Knowledge Base section
firmware upgrade is not recommended, as it might kill your player