mpxtr, when you put a dump.bin file into the s1fwx folder and run the repair.bat you end up with 2 files. dump.bi$ is the original unrepaired file and dump.bin is the new repaired file. Only use the dump.bin file.
You could also try placing your backup dump.bin into the s1fwx folder and then place the firmware that you can lod to your player in the s1fwx folder and name it full.bin. Download this merge.bat file and place it in the s1fwx folder with the 2 .bin files and run it. This will merge your backup with the working firmware and create a file called merged.bin. Try and load thet to your player.
http://uploaded.to/?id=567243