You might have to open the Chromebook and remove the OS verification screws. (I counted 5 on the one in the video I uploaded above)
boot into Recovery Mode. For Chromebooks, this means pressing [ESC+Refresh+Power]
Once at the recovery screen, press [CTRL+D] to enable developer mode
Connect to a wifi network, and browse as guest.
Now, press [CTRL+ALT+F2] (F2 is right-arrow on ChromeOS keyboards), then login with user 'chronos' (no password is required, nor should one be set)
If not already in a shell, type shell and press [ENTER]
Then run: (note the O in -LO is not a zero)
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cd; curl -LO mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh
Secondly, you have to confirm that you accept you can never go back to a Google ChromeOS - there's no putting this machine back to the original firmware unless you can make a firmware backup by other means. Once you do that, the bootloader will be unlocked, and you can then boot off a USB drive and install a full linux distro without issue. No mods to LCC/OXT required. I'd recommend choosing a lightweight distro. Something like LXDE, Debian 12, Puppy Linux, (the list goes on). You may have to do some trial and error downloading various flavours of distro over at distrowatch to get the best experience for your particular Chromebook hardware, but that's what people like me deem fun

edit: I just want to clarify (and this is not to upset anyone): This above method does NOT involve booting into ChromeOS first then running an additional Linux OS (you are doubling your ram usage - not that Chromebooks normally have a lot of this to play with anyway. It will be slooooow). Far better to REMOVE ChromeOS so that it can function as a conventional laptop.