By putting the Chromebook into the “Developer Mode”, you are able to get the full root access. Some of them include the ability to modify the system files of Chromebook. This one is often used to install the full Linux system with something like Crouton. For your information, Developer Mode also has the other functions. Fortunately, do do not have to install the big Linux system side by side with Chrome OS. In this case, you can just modify some files or boot your Chromebook from the external USB devices.
Before rooting your Android Chromebook, there are two things that you should understand. The first one is enabling and disabling the Developer Mode will wipe the Chromebook. It means that the Chromebook will be “powerwashed” as part of enabling process. Some things like the user accounts and the files will be removed from the Chromebook. In this case, it is better for you to store your data online so you can be free to log into the Chromebook with the same Google account afterward. The second one is Google does not offer support for Developer Mode. You have to know that it is intended for the developers and the power users. Basically, Google will not provide support for this one. there will be the usual “This may void your warranty” warning apply. On the other words, you just have to disable Developer Mode before getting the warranty support if you experience the hardware failure in Developer Mode.
On the original one, the Developer Mode was known as the physical switch that you could flip. On the newest one, it is like the option that you have to enable in the Recovery Mode. For those who do not know, Recovery Mood is the special boot option where you can reset Chromebook to the factory default state.
In order to get everything started, you just have to boot the Chromebook into Recovery Mode. You can do it by pressing and holding down the Esc and Refresh key and then tap the Power button. Then, the Chromebook will immediately reboot into Recovery Mode. You have to take a note that if you see the Recovery screen says “Chrome OS is missing or damaged”, it does not actually mean it. In fact, this kind of screen normally just appears when Chrome OS installation is damaged. After that, you have to press Ctrl+D at the Recovery screen.
As the instructions might be confusing for some people, it is better for you to seek a help from the professional if you really want to root your Chromebook. If you want to root it by yourself, you can ask them to root a couple of times before trying it yourself. Seeking from the professional is needed especially if your knowledge is not that wide and you are worried if you screw up your Android Chromebook. Another thing is that you can learn something from the professional as they might know something you do not know.