I had in the past your same problem but i have solved reinstalling my original firmware on the player, with this procedure:
copy the rkusb.tag file to the player main memory, once the file transfer is complete, disconnect the usb cable and switch the player off. With the player still switched off, plug the usb cable back in and wait for the computer to recognise the new second removable disk ( hidden firmware partition 60Mb), if there are files into the hidden partition delete these files, then copy all the 4 required firmware folders + RKFSWFRC.FRC from your PC into the hidden partition .Then disconnect from PC and restart your player.
One question about your firmware uploaded
here, it works?
It is for the player in
this screenshot?
I'm not sure that your player is a generic unbranded RK2706 player... in your video I've seen RAMOS when you turn on the player... while on player on your pc screen (like in my player) this writing doesn't appear.
And then my firmware, like the other firmwares for my player, are all about 58 MB, while your firmware is 29MB. So I think that you have downloaded the wrong firmware for your player
I would try to update my old firlware but your problems posted in this topic worry me and I think that your firmware isn't good for my player...