FabulandCat , it's not easy to locate to firmware that would work fully with your player. Like you experienced with your own player, even with the same version, it ends up with the blue/black screen. Most firmwares are specific to the player itself, so chances of locating a compatible firmware is slim.
Regarding the bookmarks thing, i can't say which firmware would solve it. But you would be looking for a needle in a haystack.
However, you can theme your player by changing the images and some of the text. Guide here
http://www.mympxplayer.org/how-to-mo...ng-vt1719.html