Dell Precision 5820

BIOS/UEFI Modding BIOS Modding Requests
4

As this is not easy teaching, besides quoting the tool cmds, i would suggest to do some forum reading from the Intel MEI section.
The Intel FPT tool uses the system MEI to perform several operations of reading and writing… when possible, regarding the FD (Flash Descriptor) status.

Intel (Converged Security) Management Engine: Drivers, Firmware and Tools (2-15) - Special Topics / Intel Management Engine - Win-Raid Forum (level1techs.com)

ME Analyzer: Intel Engine Firmware Analysis Tool Discussion - Special Topics / Intel Management Engine - Win-Raid Forum (level1techs.com)

[Guide] Unlock Intel Flash Descriptor Read/Write Access Permissions for SPI Servicing - Special Topics / Intel Management Engine - Win-Raid Forum (level1techs.com)

A note… careful with this tool as it performs the cmds given without verifying the data content, the human error here is the culprit.
Good luck.