S1fwx.exe does not extract a full copy of the firmware some files are not copied. If when you flash your mpx with the incorrect firmware and the files that were not copied in the dump were replaced or damaged then your backup dump.bin is not going to fix it because it does not contain the files needed.
A full firmware file is different to a s1fwx.exe dump.
You need to get your player to a point where windows recognises it as an ADFU device then use the firmware in the walkthrough to flash it twice.
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