You need the RK27xx repair tool to make your computer see the PMP.
here:-
http://mympxplayer.org/rk27dm-repair...706-df947.html
You also need a copy of the original firmware from the player, and apply it to your player with the tool, other firmware versions
will not work as Ramos often change the hardware configuration on the players and
then change the firmware to match, Onda are known to do the same trick.
:
Good Luck.