żIs that player color-LCD based, or uses a OLED display?
Seems to be OLED for me, but who knows... Anyway that's the only FW that appears if you search by MP-791C. Try upgrading in ADFU mode with MP3 Upgrade Tool 4.15 or Production Tools 4.19, these are the best & most compatible ones.
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With a bunch of MP4 players for repair... and none will be mine  , now that''s bad luck.
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