You will need to format the main drive on the player, and then copy rkusb.tag to it.
Then reboot and if the 60mb firmware partition appears then copy the 4 firmware folders to it and reboot, then pray that the player works again.
If this fails then try the RK27DM program again to force the player into Rockusb mode and use the upgrade tool to load your backup folders in.
Upgrade tool here:-
http://www.mympxplayer.org/rockchip-...v25-df881.html