Download the correct firmware directly from the HP Software and Driver Downloads page .
Always backup your corrupted BIOS before erasing the chip. Even a corrupt file contains your unique Serial Number, MAC address, and TPM keys. hp probook 640 g2 bios bin file best
You cannot just flash any dump. You must use Intel Flash Image Tool (FIT) to "Clean ME" or "Neuter ME" before flashing. Download the correct firmware directly from the HP