Mj-networker,   Would you provide the link to the specific download you were using for the update, also would you please private message me the svc tag for the switch, so I can confirm if it is an OEM model?   Let me know.    
Hello, I want to upgrade my N1124T-ON switch with provided Dell's 6.8.0.1 image and switch is telling me: STK file does not contain any images for this platform   Is anyone lse having this issue?   Regards
Wrong firmware for N1100 - 6.8.0.1