is there way to backup thread and forums only and install new Mybb and restore it

[Matt]

The point is though, in doing this you'd end up with the same data you already had, it's a pointless process to try and do. Installing just creates new database tables, so if you have data, reinstall, and import your backup, you have exactly the same as what you already had. What problems are you actually having with 1.8.8?