how to get from 2.1.1 to 2.1.0

i patched up to 2.1.1 and i wanna go back to 2.1.0 how do i get back?

please..anyone?

you could use the repair tool in your wow directory but if i remember correctly that resets to vanilla. once that is done just update as needed stoping with 2.1.0

to downgrade delete patch.mpq and then use repair and it will go back to 2.0.0 so make sure u have all updates