If you come across this screen, and you have some odd brand USB drive that manages to make ChromeOS happy (I have noticed Lexar doesn't work at all). When you try and repair ChromeOS you may get a "Security Module Not Working."

If you see this screen here are some steps to try and work through it.  


  1. Turn device on to the "ChromeOS is missing or damaged" screen
  2. Wait 30 seconds
  3. Insert the flash drive with the correct ChromeOS recovery on it for that specific model
  4. If you get the security screen again, then repeat the steps above. You may quite literally have to do this 20-30 times. 
  5. No I'm really not joking, this is an actual fix from Google. 


Good Luck!