Always use the manufacturer site page for the BIOS update downloads
http://www.gigabyte.com/products/product-page.aspx?pid=4601#bios
I'm on F9 and pretend to go to F5 as advised on this guide.
The original guide is from October 2013. I would keep the F9 version of the BIOS and install OS X on your hardware.
Thank you, i'll try that.
For all other users on this MB, are you using recent FW versions without any issues?
Yes I'm still using this system as a testing rig, and it's on latest BIOS. Running latest 10.11.4.