What is the best practice of changing app icon remotely(or dynamicly)?

Hi everyone i wonder how can i do it?
I can see some apps changing their app icon on special days(black friday etc.).How can wee change our app icon dynamically without opening our app.

there’s a package for changing, never tried it, but looks like it is maintained flutter_dynamic_icon_plus | Flutter package

and about changing it without opening the app, maybe they do it with a background task?

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