Enter the bios by restarting the device and pressing Esc on a USB keyboard, navigate to the Save & Exit tab, and select “Restore Defaults”, then select “Yes” to the “Load Optimized Defaults?” prompt.  Then navigate to the Security tab, select “Secure Boot”, and change Secure Boot to “Disabled”.  Hit F4 to save and exit.  After it boots up into Windows, delete the .config file that the update utility writes, this will be found in your downloads. It should be labeled as m3updater_uefi_148_ec_128.exe.config. Try running the update again. 
 
If the unit is failing to mount the EFI partition.

Reboot and try again.

If it still gives the same error, follow these steps:
1)	Reboot (again)
2)	Open an Admin Command prompt
3)	Pick an open drive letter like “p:”
4)	Run these commands in the command prompt window:
	mountvol p: /s
	p:
	dir /s/b
	c:
	mountvol p: /d
5)	Copy and paste the contents of the command window to a text file and send that to us.