Thanks for your interest !
I followed this process :
http://www.mympxplayer.org/previous-...r=asc&&start=0.
I do confirm there is the same structure of folders, except an extra file called "HOLDON.BIN" in the root of the device...
I thought installing those files was safe, because it's Rockchip firmware: RK27SDK-080422.
Can anyone confirm I can change the look of mine, and how ?