SoFlow SO4 2nd Gen Originalbetriebsanleitung Seite 18

WARNING!
Do not close the compartment if there is no battery in it. Otherwise, the compartment cannot be opened again.
If this still happens, you must lift the cover pad at the marked location so that you
can loosen the two screws located underneath.
Loosen the two marked screws to be able to open the cover again.
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