MyBB Community Forums

I would like to change some forums ID.
I can just change "fid" in mybb_forums?
Or it is more complex than I think?

It's more complex: you'll have to change fid values in different tables (as post, forumprefix, ...).
And why change the id ?

You can easily change the forum ID in the database only when there are no threads existing.
After changing update the forum cache in ACP.

With existing threads and posts, Crazycat's said what else to do.

@Crazycat
It migh tbe just a reasonable cosmetic
I did the same for a more meaningful and beauty enumerartion.

[ExiTuS]

Since the subforums I want to change are empty I try so...

It worked fine, thanks!