To 'upgrade' to IPB 3 final, you'd need to follow these:
1) Create a dump of a clean Beta 4 database
2) Create a dump of a clean Final database
3) Create a dump of your database
4) Compare (1) and (2) against (3).
5) Run the queries to update (3) to match that of (2).
6) Upload the new files.
That's just a quick summary about what to do. It's a lot more harder in reality. :rolleyes: