try to use intel fpt using the command "fptw64 -f -bios Z39PG4S1.40C " (copy paste the bios file to Win64 on flash programming tool\Win64 folder, then run cmd as admin, then redirect using cd /d Directory to Win64 folder of Flash Programmer Tool (example: cd /d D:\FPT)) to flash it, if you could flash it, reboot to bios and immidiately reflash the bios with normal instant flash.
OR you could try to flash using DOS version of intelfpt, just make a dos drive using a pen drive and rufus, copy paste the contents of DOS folder directly to the DOS pen drive and copy paste the bios you want to flash to the pen drive. DWYOR
Intel FPT for your board is CSME System Tools v12 r38, inside the Flash Programmer Tool folder use the Win64 one: File folder on MEGA
Source: Intel (Converged Security) Management Engine: Drivers, Firmware and Tools (2-15)