Lenovo Chromebook Duet developer mode unlock

1. Press volume - and volume + buttons at the same time and boot the device
2. You should see prompt saying "Please insert a recovery USB stick." with a helpful image showing USB port that doesn't exist on Duet
3. Press volume + button, now you should see a menu with options like "Show Debug Info", "Cancel", "Power Off", and "Language"
4. Press volume + and volume - buttons at the same time. Option "Show Debug Info" will be replaced with "Confirm Disabling OS Verification"
5. Select this option by using volume buttons and confirm by pressing power button
6. The device now should boot up in Developer Mode saying that it is INSECURE