Question Edifier S550 lose sittings every time i unplug the power!

Jun 23, 2020
Hello there.
I have Edifier S550 with a very annoying problem,
every time I restart /unplug and plug the power it loses settings such as volume / Center volume/sub volume etc.
I wonder if there are some batteries at the control unit that should save the settings,
especially this subwoofer is 12+ years old, but I'm not quite sure,
Does anyone have ideas?
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