If it is consistently failing during the recovery process, there is not a lot that you can do to fix it. I suggest that you contact Intel Customer Support and RMA the unit...
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Thanks Scott, Please contact our contact center to process a replacement.
on my new NUC6i5syh I removed the jumper to do recovery update from usb and nothing happened, and reapplied power and started unit but bios update never started, then I tried again but this time pressed power button for 4 seconds, led turned orange and I got menu it had option to do recovery bios F4 so I pressed F4 and after it was done it said flash update failed tech info (0x000000000000007,0) , all was ok except management engine firmware failed . need help please