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Depending on player model and a particular reseller, Dune player may be shipped with a preinstalled System Storage. To check if the player already has System Storage, go to "Setup / Information" and check the status of "System Storage" line.
This box has a custom test scripts and applications like a 3 web browsers, players, social network etc... most of them working fine but I like to try some other custom programing - I like to backup existing in case if my testing fail
I am not aware of any feature to allow you to backup the currently installed firmware on any Dune media player. As I previously said there is normally no need for this as you can just install any firmware, old or new. If you do have a special firmware then you will need to get a copy of it from whoever created it.