Have you tried a manual factory reset?
- connect your Forma to a computer/charger for at least 1 hour.
- Press and hold the power button. If you don't see any message on the screen, hold it for ~30 seconds.
- Press and hold a page turn button (doesn't matter which one).
- While continuing to hold the page turn button, press and hold the power button.
- Wait until you see the resetting message on screen (up to 40 seconds) and then you can release the page turn and power button.
- Set your Forma up either over WiFi or using the Kobo Desktop Edition on your computer.