Dell Latitude E5570 BIOS 1.7.3 Update Failed

Hi, I have repeated experience of failed BIOS firmware update on Dell e5570. More precisely the part

"Sending Intel (R) Management Engine Firmware Update" always hangs on 100% and never finishes.  The annoying thing is that laptop cannot be shutdown via power button (even with the long press) and I have to wait hours till my battery dies :-(

Im trying to update BIOS from 1.6.3 to 1.7.3. In the end, I have 1.7.3 BIOS version, but Embedded Controller stays on A07 instead of A11 so I got my PC into middle of versions :-( First broken thing I noticed is WiFi always turned off after wake from sleep or after startup.

Dell support, please help. I need new BIOS (and Embedded Controller) to resolve some NVMe and other issues with the laptop.

Thanks, M.