luistkd , you'll need to try all the v9.0.xx series firmwares here
http://www.mympxplayer.org/actions-9...mare-dc37.html
If these do not work, then there is nothing much you can do. As your original firmware was 9.0.50, it is currently not supported by the firmware extractor, so others with a working v9.0.50 are unable to extract theirs to upload to the forum.