Well, i am sure that i have the same one player, but extracting firmware is smallest problem. Is your player completly dead? is the light on? Well if it is off you need to try to flash it with merged firmware from MP-693C-S.
You should get the white screen and all manus should work, but not screen
The same firmware has 735 i think because it has the same pictures of menu and shut down. If you can help Me and yourself Please take the link on forum to help others
Maybe can help:
Screens of firmware
MP-693c-S Firmware