1. Because of your mainboard don't have usb flashback feature ,so the first question you will meet is how to re-flash the mod bios.
Intel fpt tool is a good choice ,but i don't have similar experience with use fpt tool in this platform(intel b460,z490..etc) ,so i'm not sure if it's feasible to re-flash ,it need to take a try.
2. What is "spread spectrum settings" that you mention ? Could you explain them in detail?
3. I recently have some modify cases about unlock HPET and spread settings , so i guess you need is RFI settings ,please refer to the this
link.
link2
link3
link4
4. First make a bios dump with this
tool and attach ,then capture some bios scrrenshots under below path.
Advanced tab.
Advanced > CPU Configuration > CPU - Power Management Control
Advanced > System Agent (SA) Configuration > PEG Port Configuration(*.please scroll the bottom then make a capture)
Advanced > PCH Configuration