Updating MrChromebox Custom Firmware

This guide is for updating UEFI Full ROM firmware on devices that already have MrChromebox UEFI firmware installed. If you haven't yet installed UEFI firmware on your device, see Flashing Firmware instead.

IMPORTANT

The Firmware Utility Script can only be run from ChromeOS or Linux. If you are using Windows, boot a live Linux ISO (such as Ubuntu or Fedora) from USB and run the script from there.

NOTE

The curl application is not installed by default on some Ubuntu / Ubuntu-based distros. To install it, run: sudo apt update && sudo apt install -y curl

Update Process

  1. Run the Firmware Utility Script:
    • From a terminal, run: cd; curl -LOf https://mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh and press [ENTER].
  2. The script will detect your current UEFI firmware and display the UEFI firmware menu
  3. Choose option 1: Install/Update UEFI (Full ROM) Firmware and press [ENTER].
  4. Follow the prompts - the script will automatically preserve your device-specific data (serial, HWID, VPD, etc.)
  5. Assuming no errors occur, reboot your device.

NOTE

Firmware write-protect does not need to be disabled when updating UEFI firmware, as the software write-protect remains disabled after the initial installation. If you previously re-enabled hardware write-protect (reconnected battery, reinstalled WP screw), you do not need to disable it again for updates.

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