Restoring the Stock ChromeOS Firmware

Requirements

• Linux installed on the device, or a bootable Linux live USB.
• Network connectivity
• A USB containing your stock firmware backup image, or
• A ChromeOS Recovery USB

Restoring

1. Boot Linux

2. Ensure curl is installed

   • For Ubuntu-based distros, run: sudo apt update && sudo apt install -y curl

3. Run the Firmware Utility Script:

   • cd; curl -LOf https://mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh

4. The script will detect your UEFI firmware and show the UEFI firmware menu

5. Choose option 2: Restore Stock Firmware

6. Select your restoration method:

   • Option 1 - Restore from USB backup: Use your previously created firmware backup file
   • Option 2 - Restore from ChromeOS Recovery USB: Extract firmware from a recovery image

7. Follow the prompts and provide the required USB drive when requested

8. Reboot after successful completion

With the stock ChromeOS firmware restored, you can now perform a ChromeOS USB recovery to reload ChromeOS.

Related Documentation

• Reverting Overview - Complete reverting process overview
• ChromeOS Recovery USB - Creating and using recovery media
• Firmware Utility Script - Restore stock firmware function
• Making a Bootable USB - Create Linux live USB for restoration
• Known Issues - EOL device restrictions
• Unbricking - Alternative restoration methods