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I have activated the legacy mode and I can see all my drives, I select the nvme boot ssd and nothing, I made a clone and put it in a sata port and I can't see the windows either.
I used my DELL OS DVD to maybe repair the boot with the windows tool and it doesn't work, another detail I noticed is that the DVD doesn't give me the option to install either.

What keeps me believing is that the hardware is recognized and passes the tests perfectly.

Can someone please help me?

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I had an identical issue on a HP workstation. This is what worked for me:

1. Attempt to boot in legacy mode. You should get a "no boot device" or similar error.

2. Switch back to UEFI mode with secure boot on, and reboot.

Hope this also resolves your problem.

Thank you very much for your contribution, in my case I did that and more, I tried everything, I touched everything in the BIOS, I tried all kinds of configuration with physical disks and nothing could be done with the windows image.
The solution was to reinstall from scratch, right now I'm in my beautiful DELL 5820.

I will detail my case in order to help the one who will have the same problem.

i need your help same situation lopst the disc as well ordered one online but that didnt wwork either should be on my thumbdrive from your site but excat same issue

i have the issue what caN I DO

@DELL- కేర్స్ 

Hi sir

Check mi laptop trouble

hi, im facing that my dell precision 5820 using nvme cannot find boot device after clonning. But i boot manually using F12 and select UEFI boot and can boot normally.. Pls help me how to boot auto