2.5.1 to 2.7

I’ve this meta tag in the header of a wpmu blog:

<meta name=”generator” content=”WordPress 2.5.1″ />

So I think I’m running 2.5.1 🙂

I want to update to 2.7, but since the procedure is delicate, I’m asking here what part of this page should I follow. I’ve already backup db and files.

2.6 to 2.7
1.5 to 2.6 (that should be 2.5 to 2.6?)

I suppose I need to copy files preserving configuration’s ones and wp-content/, and run the upgrade button from the dashboard, am I right?

Thanks