Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
How to update Pfsense CE from 2.4 to 2.7 without reinstallation.
What upgrades is it offering you?
You might have to do it in several steps.
If you really are running 2.4.0 though I would reinstall.
Steve