I upgraded BIOS on my NUC from version 72 to 82 (latest, at this moment).
After that, I got warning on boot: "(A7) Me FW Downgrade - Request MeSpiLock Failed".
I followed 'BIOS Recovery by Security Jumper' documentation, but got and error, while flashing BIOS:
Flashing image for Intel(R) Management Engine firmware ... [failed!]
Flash update failed!
Technical information: (0x8000000000000007, 0)
After that, I turned NUC off, placed jumper back and plugged power in. Power button glowing orange (as expected), but after pressing it, NUC completely powers off (except of green light on motherboard).
Model: Intel NUC NUC7i7BNHX1
RAM: 2 * HyperX 16Gb
OS: VMware ESXi 7.0