According to the manufacturer's website, the BIOS required is 3605 -- https://www.asus.com/Motherboards/P8H61M_LX/HelpDesk_CPU/ That BIOS was released in 2012 and the latest BIOS in 2014 -- https://www.asus.com/Motherboards/P8H61M_LX/HelpDesk_BIOS/ BUT, unless you have a working CPU that will tell you what BIOS you have there is no way to update the BIOS. I assumed you had a functioning system and were upgrading. But from your later post that may not be the case. There is no way to determine if you need a BIOS update or not.