Like I said there is only a slight chance that you will have to.
If your system boot normally you are good to go.
If you need to update the BIOS you will need a non Haswell Refresh CPU to do so, and it can be a pain the neck.
I built an htpc lately with i3-4160 + B85 mobo and encountered no problem at all.
You may try to contact your specific retailer to make sure but you should be fine unless you get a mobo from a very old batch.