jordipt , at the moment, the firmware extractor S1fwx only supports upto v9.0.43, so there is no use in trying to extract a version higher than that. Also, since your player is dead, there is also no use in trying to extract any firmware from it. As the original working firmware has been erased with a non-working firmware.
What i can suggest is to try all the v9.0.xx series firmwares here
http://www.mympxplayer.org/actions-9...mare-dc37.html