your player is definately a new rockchip
the rkusb.tag should have worked as it is the generic one for new rockchip players
Maybe the factory decided to call it different name, for instance teclast call theirs "teclast.sys", so it may be possible that either the factory or cdrking have had that renamed, but its a small details and not sure they would have done this but they must have done otherwise it would work
BTW, Pasen in china were the first to bring out this model called the F12, but they have no firmware to download
http://www.pasen88.cn/window.asp?id=212
This really should work
BTW what OS are you using, i think Vista may have probs or 64 bit may also be a prob, this really should work