Just because it looks the same doesn't mean it will work. The UI of all Actions players are very similar, but the hardware may be wired differently.
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Is backing-up the firmware a sure way to be able to restore the player even if I put the wrong firmware on it?
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No. It will give you a better chance though. Unless you are very familiar with the hardware and the programming skills required to write your own firmware and/or modify an existing one to work with your hardware, don't do it.