Let's start by getting more info about your device. Open your ChromeOS settings, then About ChromeOS>Additional Settings, then click the Copy icon (which looks like 2 pieces of paper on top of each other) next to Build Details. Then post that info in a response here.
If the forum software incorrectly blocks you from doing so, then take a screenshot of the info instead and share that image. (The info is not sensitive, despite what the forum software might say.)