Lots of angles here.
Inserting and removing the USB cable counts as opening and closing the cover.
You can also try some magnets.
If you're in a bootloop, it's just because Android is pissed at you.
I haven't got to the bottom of it all, but you're better off modifying system using Magisk (i.e. make your own "module", i.e. writing a module.prop and sticking some files in your own "scratch" module.)
If you're in a bootloop and it's screeching, do a "stop" to stop the Android subsystem. You can get to fastboot with "reboot bootloader". I've got a not-ready-for-primetime recovery for Poke3.
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