if you have access to the players then extract the firmware from another player and that is the best and safest way
no, scrap that, this is the older rockchip player and firmware can not be extracted
must say though, i did not think that there were clones made of this player as the original went down like a lead balloon
only other re brander i know of is pasen, they have a verion of this player but i imagine, am sure, it is the teclast player so may not work
firmware here
http://www.pasen.it/download/shakeit_firmware.rar
BTW does your player have any screws on the side of the player?? just a thought
well, try the pasen firmware but i dont think it will work, but hey