Enable the config for device code: `evert_n`

Enable the config for device code: `evert_n`

…; improve logging in this case

…#175)

This PR adds:
- A button that appears when no config is found for a device code. The
button redirects to a github issue requesting support for the device.

- Update the unlocking instructions for FP3/4 and add
fastboot_unlock_critical command.
- Update tests and fix formatting.