1. A method of operating a Network Function Virtualization (NFV) system to recover from a Virtual Network Function (VNF) crash, the method comprising: first NFV processing circuitry executing a VNF, and in response, the first NFV processing circuitry supporting a wireless data communication service and transferring VNF state data; VNF memory circuitry receiving and storing the VNF state data; Management and Orchestration (MANO) processing circuitry executing an NFV orchestrator and the MANO processing circuitry responsively detecting a crash of the VNF by failing to receive heartbeat messages from the crashed VNF and responsively retrieving the VNF state data for the crashed VNF from the VNF memory circuitry; the MANO processing circuitry executing the NFV orchestrator and the MANO processing circuitry responsively directing second NFV processing circuitry to execute a new VNF to replace the crashed VNF based on the VNF state data; the second NFV processing circuitry executing the new VNF based on the VNF state data and the second NFV processing circuitry responsively supporting the wireless data communication service and transferring additional VNF state data; the MANO processing circuitry executing the NFV orchestrator, and in response to the VNF state data, the MANO processing circuitry establishing a new Hardware Root of Trust (HRoT) relationship between the new VNF in second NFV processing circuitry and an HRoT control system; and the second NFV processing circuitry using a secret read-only HRoT key embedded in the second NFV processing circuitry to hash a random challenge from the HRoT control system and the second NFV processing circuitry and responsively transferring a hash result to the HRoT control system for hardware identity verification.