Did you follow the Kobo manual factory reset for the Libra 2?
- Connect your Libra 2 to a charger for at least 1 hour and leave it plugged in.
- Press and hold the power button for 30 seconds
- Release the power button
- Press and hold one of the page turn buttons
- While holding the page turn button, press and hold the power button
- Wait for the screen to flash and start the reset procedure (up to 30 seconds)
If this doesn't work, you can try copying a Libra 2 µSD card image to a new µSD card. See the
Kobo µSD Card Image Requests to request a link to an image.