This means that the unit's BIOS Configuration jumper (that's the yellow one) is dislodged, in the 2-3 position or is missing. Dislodged or missing can sometimes happen in shipping if the unit is subject to abnormal shaking. Open the chassis and restore the jumper to the 1-2 pins and you should be good to go. If the jumper is missing, look in the box that the NUC came it to see if it vibrated right out of the chassis. If it isn't there, contact Intel Customer Support and they will get one sent out to you pronto...
Hi Scott, the jumper is there and is already in the 1-2 position. I moved it to the 2-3 position (BIOS security) and that only disables the BIOS menu from showing. I moved it back to the 1-2 position and it still shows "System in Manufacturing Mode". Sound like we got a bad unit?
Is this a Preproduction sample (ES or PP) version of the NUC? If you are unsure, respond with a picture of its bottom label and we will help you figure it out. If it is a Preproduction version, it is very common to find that you are unable to upgrade the BIOS. If this is the case, there is a good chance that there is nothing that you can do about it. You should return the unit to whomever sold it to you and get your money back. You should also report them here; the unit is the property of Intel and they had no right to sell it to you or anyone else.