Chrome100 is a directory of recovery images for Google's operating system Chrome OS.
Chrome OS recovery images are a necessity for any IT admins or a Chrome OS hobbyist. Chrome OS recovery images can be used to repair broken installs of Chrome OS, bypassing being pinned to an outdated version of Chrome OS, or more desirably: downgrading to an earlier version of Chrome OS.
Downgrading Chrome OS may be done in order to continue using a deleted feature, patched bug, or to avoid a new feature. This opens the door to many patched CVEs and exploits being used, despite being patched in newer versions of Chrome OS.
Yes. Although your IT admin may notice you're on an earlier version of Chrome OS (which often goes unnoticed).
See the guide.