updating from 3.1 to 3.2 is a major undertaking, not suggested.
updating from 3.1.2 to 3.1.12 is not that hard, just time consuming.
however, if you want to update to 3.2 then you need to get a new 3.2 style and use it. find one that is close to what you have and tweak it if needed.
what style are you using now with your 3.1 board.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
Premium phpBB 3.2 Styles
If a tree falls in the forest and nobody is there, does it make a sound?