When Sony updated the PRS-500 to handle ePub, you had to send it in. It was just a firmware update. If it's not able to handle ePub, it never will as Sony is not doing that any longer.
Honestly, I cannt see anyone still using a 500. The screen contrast is very poor. It's heavy. The battery most likely would be not good. And no front light. And if it doesn't do ePub, it never will.
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