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Boot in developer mode and access the Chrome terminal https://www.tbi.univie.ac.at/~ronny/acer-cb5-311.html https://wiki.debian.org/InstallingDebianOn/HP/Chromebook%2014 https://www.howtogeek.com/210817/how-to-enable-developer-mode-on-your-chromebook/
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Remove the battery as it had write protection to the operating system or disk https://docs.mrchromebox.tech/docs/firmware/wp/
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Allow executing scripts on the disk. https://unix.stackexchange.com/questions/6821/in-chrome-os-bash-wont-execute-my-script-how-do-i-get-bash-to-run-my-script
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Install a mystery script that loaded a BIOS replacement & backup ChromeOS. You may need to remount the drive to run this. https://docs.mrchromebox.tech/docs/fwscript.html https://askubuntu.com/questions/1079944/cp-cannot-create-regular-file-read-only-file-system https://linuxconfig.org/howto-mount-usb-drive-in-linux
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Install Debian using BIOS replacement https://wiki.debian.org/DebianInstall
Mr Chromebox: docs.mrchromebox.tech