how to convert Mybb 1.4x to SMF 2.0 rc3
I don't think the converter for RC3 is available, yet. :(
Convert to smf 1.1.11, then upgrade that to RC3
ok bro i try to upgrade
where is link in upgrade
There is a converter to RC2, I think it should work for RC3 as well. You can find it in Downloads > Converters.
As for your question, here is the upgrade procedure: Upgrading SMF (http://docs.simplemachines.org/index.php?board=3.0;sort=subject)