That's a hardware problem, your LCD module is bad. The only solution is to replace it (very difficult to get the same part, better buy another player) as no FW-upgrade could solve that, because isn't software related. I'm pretty sure everyone will agree on that.
¿Can you post a photo of the player with LCD like that to confirm this, please?
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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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