yesh , there are very limited v9.1.50 firmwares, as the extraction tool only supports upto v9.0.43 at the moment.
what i can suggest is to try all the v9.xx series firmwares here
http://www.mympxplayer.org/actions-9...mare-dc37.html
If they do not work, try contacting your seller and see if they have the firmware to send to you. Also search the CD that came with your player, sometimes it is inside. It should be in .fw or .bin format.