Hi ice71091,
Unfortunately that just means the s1fwx tool can't detect the firmware on your player completely. Your firmware is version 9.1.52 which is the newer firmware and the s1fwx tool can't detect all 9.x.x firmwares at the moment and it seems it can't detect yours. So that unfortunately means you won't be able to modify it using the s1fwx for the time being.
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