Updating Custom Firmware


These steps require linux. Firmware Cannot be flashed from Windows. Do not try to flash from a virtual machine such as wsl. If you are using Windows, boot a live linux iso, such as Ubuntu or Fedora Workstation.


curl is not installed by default for Ubuntu / Ubuntu distros. To install it, run: sudo apt update && sudo apt install -y curl

  1. Run MrChromebox's firmware utility scriptopen in new window.
    • In case you forgot, type cd; curl -LO mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh and press Enter.
  2. Choose option 1: Install/Update UEFI (Full ROM) Firmware, and reboot if successful.


Do not reboot if flash was not successful

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