Tom,
Yes, I have secure boot off. On the Dell Optiplex 3020 PCs we have, I have to turn off secure boot and enable legacy boot options to have the option to Boot to NIC. I have also left secure boot off when uploading and downloading the image, again due to needing to enable Legacy boot options, which will not work with secure boot on.

After the device downloads the image and reboots, I turn it back on before windows has a chance to load the first time, and reboot the device. It still shows me the winload.efi error

Hello all,
I am having an issue with deploying Windows 8.1 to devices. I can upload the image, register a device, and then create the download task for that device. I turn the PC on, boot to NIC and it downloads the image no problem.

However, when the PC reboots it flashes the DELL boot screen and then shows me an error page and gives me 3 options. I have found that the issue is an error where the winload.efi is missing or corrupted. I DO HAVE A WORK AROUND FOR THIS.

I have been able to pop in the OS dvd and boot to the CD drive (after turning off legacy boot and re-enabling secure boot) and open the troubleshooter to launch the command prompt. I type in 4 commands:
bootrec /scanos
bootrec /rebuildbcd (Here it finds C:\Windows and asks if I would like to use it. I of course say Yes)
bootrec /fixmbr
bootrec /fixboot

and then exit the command prompt and turn off the PC. When I turn it back on, it boots up to Windows just fine.

My question is that although I have a work around in place, is there something I did wrong with the original image, upload, or download that would cause this to happen? I have imaged 4 PCs this way off the master image I created and uploaded to our server. The workaround of doing the bootrec commands works great, I was just wondering if anyone had any ideas that could correct this for future devices I deploy within the school district. Thanks!