In regard to your concern, I would like to confirm some details:
-What is the image that you are using?
-From where do you want to boot, an external device, like and USB or any other?
-Could you, please provide me with the model of your NUC?
Once that you reply, I will continue with the investigation of your case as soon as possible.
Hope I can hear from you soon.
- As indicated in my initial post, it's a Windows 7 x64 image. The image was taken from the NUC, post install.
- As indicated in my initial post, the boot order is LAN then the internal M.2 drive.
- As indicated in my initial post, the NUC is a NUC6i5SYH.
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I do apologize for the delay on my reply.
I am still working on the investigation of your issue. I will try to replicate it.
As soon as I have further details, I will inform you.
Thank you for your valuable time.
We have the BIOS version .57 that has been released on 01/19/2017. My recommendation is to complete this update.
BIOS Update [SYSKLi35.86A] (Version: 0057 (Latest) Date: 1/19/2017)
Please let me know how it goes in order to further assist you if required.
Thank you for the update.
BIOS v57 has not resolved my issue.
I am still unable to boot from NVMe after booting (and falling back) from LAN.
If I press F10, boot LAN the fallback to booting from NVMe works.
I have been looking for information about this matter and I understand you are loading an image of Windows®7 64 bit and NVme drive.
The first thing you need to know is that Windows®7 does not have native support for NVme and you are require to load from Microsoft* a hotfix.
Please refer to the following article from Microsoft's website
Hope this information is helpful.
Please do let me know if you need further assistance with your Intel product, I will be glad to assist you.
Thank you for the link.
Hotfix KB2990941 is already installed in the Windows 7 image.
The Windows 7 image was made from the NUC after Win7 x64 SP1 was successfully installed.
IMHO, this issue relates to what is taking place when F10 is pressed during boot, and why doing so causes the NVMe drive to become visible to the boot process of my imaging solution.
After further testing it appears the issue is resolved. I'm unsure exactly what caused the problem to go away.
I changed Hard Drive boot delay in BIOS to 5 seconds, and disabled the SATA channel (thinking this might help). After a reboot the the NUC is now booting from iPXE as required.
I went back in to BIOS and undid my changes, and the NUC is still booting as required.
I'm presuming BIOS v57 did in fact resolve the issue, but not until changes relating to storage were made in BIOS....somehow....
Alternatively, a cold boot may have been required to complete the v57 update....can't say with 100% certainty.
Thank you for helping to resolve this issue - I sincerely appreciate your time and effort.