Supported CPU's for your motherboard: https://www.asus.com/us/Motherboards/H81MPLUS/HelpDesk_CPU/
Core i3-4170 since BIOS 2106
A new board should come with the most recent BIOS, so the i3-4170 will work out of the box. In the off-chance you get one with an old BIOS you can download the BIOS update to a USB stick from here:
https://www.asus.com/us/Motherboards/H81MPLUS/HelpDesk_Download/