Acer 311 but any chromebook with an Intel Gemini Lake processor has a locked bootloader and bios. Developer Mode can be enabled but the most that gets is installing crouton which is still beholden to booting Chrome OS and using it's kernel.
Oh, huh, indeed that seems to be more involved than just developer mode.
That one supports CCD, so you can still "root" it, but instead of just enabling developer mode, you also have to connect a cable and go through a slightly more involved process.
