What (if any) you are currently seeing on your screen? Your current BIOS version date listed on your boot screen?
Many Foxconn motherboards feature a physical jumper on the board or a setting in the BIOS to prevent accidental flashing. foxconn h61mxv v20 bios update verified
I can provide the exact command lines or file names required for your specific hardware configuration. Share public link What (if any) you are currently seeing on your screen