It’s preferable to work on ones own firmware- dump.
Regarding freshly re-configuring ME region to remove corruption see
Dell update contains a bios region, not a complete firmware image. It normally is easier to use a stock bios region and import the machine specific data from the firmware dump.
You may try to update the ME firmware to the latest 11.8 firmware, Intel tools and link to latest 11.8 ME firmware are here (if the update doen’t work it might be a sign of a corrupt ME):
Intel tools (fpt) can be used for a complete dump by software (if not restricted), too.