- On the working computer (not the Chromebook with the error; you weren't going to do that, were you?), install the nigh-awesome Chromebook Recovery app.
- Insert the media you'll be using as a recovery disk into a Windows or OS X computer that you have admin rights on. The thumb drive will be wiped, so backup your lolcats first. (You might want to make a few of these while you're at it)
- Open the app and follow the on-screen instructions to create the recovery media.
- Run the recovery tool and tell it which Chrome device you're building a restore image for.
- Open the Chromebook you want to recover.
- If you have anything connected to this Chromebook (such as a mouse, SD card, or external hard drive), remove it.
- Enter recovery mode: Press and hold Esc + Refresh Refresh, then press Power Power. Let go of Power, then let go of the other keys. You'll see one of these messages:
- "Chrome OS is missing or damaged. Please insert a recovery USB stick or SD card."
- "Please insert a recovery USB stick or SD card."
- Insert the recovery media you've created (SD card or USB drive).
- Follow the on-screen instructions.
Q: "I restored my Chromebook, but now I can't use my USB flash drive or SD card anymore!!"
A: Easily solved. Use the nigh-awesome Chromebook Recovery app one more time to erase your USB flash drive or SD card so you can reformat it.