New
#81
the d was missing
bcdedit /set {bootmgr} device partition=\Device\harddisk1\Partition3
OK
reboot
and
reg query HKLM\SYSTEM\CurrentControlSet\Control /v FirmwareBootDevice
usually these steps are executed from a PE-environment
but try again
diskpart
sel disk 1
sel par 3
assign letter=S
exit
bcdboot c:\windows /s S: /f UEFI
reboot
Do you have a USB-Bootmedium?