This is a nice guide.

In my experience, it isn't necessary to configure ChromeOS by logging into a Google account after enabling Developer Mode, if you simply want to ditch ChromeOS and flash the UEFI firmware. Just press ctrl+alt+F2 to get a shell, login as chronos (no password), then type `sudo bash` or `sudo -s` to get a root shell.

In addition to the other recommended distros, NixOS runs well on all my converted ChromeOS devices.

It's a great way to get continued use out of hardware that no longer receives ChromeOS updates. Even underpowered devices can be appealing for some tasks because they're lightweight and fanless.