Flash ME firmware Error 366: Failed to verify signature of OEM or RoT key manifests

CSME tools are in the appropriate threads, vestions 2-15 are here: Intel (Converged Security) Management Engine: Drivers, Firmware and Tools (2-15)

16+ are here: Intel (Converged Security) Management Engine: Drivers, Firmware and Tools (16+)

Although in the 16+ the link to what you need is in the last post of the thread at the moment.