All Chromebooks post-2015 contain an enrollment chip. This enrollment chip is a large chip under a thermal pad; once you remove it, the Chromebook will be unenrolled. This should not be a difficult process, just pull it off with a high level of force (do not worry, you will not damage anything). However, if you do end up damaging something, even with a screwdriver, it will be enough to wipe enrollment, but don't file a lawsuit against me for any liabilities you may incur.