You're sure you've tried a power off / on? Screen should change to saying powered off and then the device will start the power on (3 circles flashing).
Rather than a reset via the power switch you can go to Settings | Account and do a sign out from your Kobo account. This will delete the database on your Kobo and remove any books from the Kobo store but will not delete books sent from calibre from the device
You will however have to through the setup steps again
Sent from my Pixel 7a using Tapatalk
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