Updating a Galaxy note (bought secondhand)

Bought a second hand Note. It's rooted as CWM on it. It won't update OTA (no updates showing at all for the past couple of days), and it's on 2.3.6.

Can I manually install an update via Odin? If so which one?

Direct links would help, I'm a bit of a noob :)

U.K Note btw