Here’s some new text from the Intel Firmware Engine download page:
Intel® Firmware Engine Versions 5.00- 4.00 and corresponding Platform Installer Packages, which include Leaf Hill version 1.0 -1.1, MinnowBoard Turbot B21 Version 1.0 and Intel® Firmware Engine SDK Release 4.0, will no longer be available after August 31, 2019 and will not be supported with any additional functional, security, or other updates. All versions are provided as is. Intel recommends that users of Intel® Firmware Engine uninstall and discontinue use as soon as possible.
https://firmware.intel.com/learn/intel-firmware-engine/downloads
Firmware Security 