In this article I'm going to be talking about how to get GalliumOS on a HP Chromebook 14 (FALCO). It's not super hard, but it does take time.
Remove the RW screw from the motherboard.
Get into Developer Mode
Take a look at this page that describes the steps to going into developer mode and getting a root shell:
Replace the frimware with a UEFI Firmware
I like to use the firmware from MrChromebox.tech. Follow these instructions to install the new firmware...