Sorry I didnt notice your mobo is micro atx. Since it is a small board, you may have some problems assembling because all parts are very close to each other
As of BIOS, most probably you will get updated BIOS. if you dont, then use bios Flashback, it's very simple to do, just copy the bios file to a USB drive, put it in the white USB port on the I/o panel and hold down the flashback button tell the light starts flashing. Wait tell lights stop flashing and your done
. Watch youtube tutorials and understand the process well before flashing the BIOS.
You dont need CPU to be in the CPU socketfor BIOS update.