3F0 boot device not found error repeats constantly after power loss

[modemasue]

I did all as you said. What is this supposed to do? Are there any more steps?

[VH2000]

Did you get any error message?

Before you reboot, make sure that Legacy is disabled and you run in UEFI

Reboot and see

[modemasue]

No error message. I managed to reboot to Windows. Do I have to turn off Legacy Boot Order in Boot Options? Because here in my case both UEFI Boot Order and Legacy Boot Order are already selected.

[VH2000]

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@modemasue wrote:

No error message. I managed to reboot to Windows. 

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Great ! That's it! you managed that!

Leave everything as it is!

[modemasue]

Ok, thank you for help. So, should I leave both UEFI boot order and Legacy boot order selected, or should I disable Legacy? 

[VH2000]

You can disable Legacy and don't forget that you are running in UEFI Mode

Edit: In the bcdboot command I selected de-de as locale Here the right location/language is to be selected.

But that can be changed later by bcdedit commands

[modemasue]

I turned Legacy off and now can't boot to windows 😞 

It shows automatic repair message and "Startup Repair couldn't repair your PC". 

[VH2000]

strange, so go back to the setting before

[modemasue]

I turned like it was before but I still get the same message, automatic repair, attempting repairs and in the end it fails. Is there a way to troubleshoot this?

[VH2000]

Same procedure

bcdboot c:\windows /l de-de /s B: /f UEFI

was my country setting

I don't know what your Location/Language is.

If you have a second computer type bcdedit in cmd (admin)and look for locale in the 5th line