ATTENTION!!!
Here the solution at the problem of the two devices!!!
After coping the file rkusb.tag into the root, the restart and the connection to PC, we can see 2 devices, but if you delete the file rkusb.tag, after the restar, the second devices (the hidden partition of the system files) doesn't disappear!...
Because you must replace some system file before deleting rkusb.tag!!!
Go to /Resource/BID of the hidden partition
I tried to copy BMP0.BIN on my PC, then I've deleted BMP0.BIN in the folder and finally I've recopied BMP0.BIN from the PC to the folder.
Then I've deleted the file rkusb.tag and restart the MP5...
So with the next connections the hidden partition disappear!!!
If this doesn't happens, you tried to modify the file BMP0.BIN changing some image before the "recopying" onto device!
