What you *can* do if you want to start from scratch, is a full factory reset. It'll wipe the device and reinstall the FW version the device shipped with.
On current FW, it's slightly more hidden than it used to be. You either have to trigger the right button sequence during boot (c.f., Kobo's support page for your device), or it's also available in the hidden Developer settings menu (search for devmodeon, then check the Device settings page).
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