Chromebook not updating

Problem

Specific model of Chromebook won't update to the latest version of ChromeOS.

Environment

any specific model

Solution

On https://chromiumdash.appspot.com/serving-builds?deviceCategory=Chrome%20OS

1. Check the model and see what OS versions are supported. Sometimes, when latest release of OS is not available for specific Chromebook model(s), when  it didn't pass the testing of the engineers for compatibility and stability. And in such case version marked as non-green color and that's the explanation why issue is happening.

2. If color of cell is green, proceed to consult T2 as it's general auto-update issue (provide combined logs).