https://mrchromebox.tech/#fwscript
Remove write protect screw
Hold Recovery button (with paperclip) while powering on
Press CTRL-D
Press recovery button when prompted
wait for awhile for it to enable Developer mode
get to login screen
CTRL-ALT-F2 to get command line
chronos
cd; curl -LO mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh
Install UEFI Firmware
After a couple reboots, if it's stuck on glitched graphics for a few minutes, put in USB UEFI for OS
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