You may want to check out Rockbox compatible devices. I think there's some flippable SanDisk ones.
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Can't really give you a recommendations but a starting point could be the rockbox firmware. They have a list of mp3 players that they have been able to install their custom firmware on. https://www.rockbox.org/wiki/TargetStatus Maybe there is a player on that list that you like. Do note that the last update was in 2019 so the devices on that last are probably even older than 2019
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