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    This has now essentially nothing to do with Linux/Unix, so it is likely to get redirected to SuperUser.SE. But now you'll need a UEFI-bootable Windows installation media so you can run the boot repair process in UEFI mode to write the Windows UEFI bootloader onto the ESP partition. See this link. Commented Sep 5, 2021 at 22:39
  • OK, you're right @telcoM. Running the boot repair process in UEFI mode from Windows installation media failed, but your link seems to be feasible. So, would you or any one be able to move it for me pls? Commented Sep 5, 2021 at 22:43
  • Discussion threads can't be moved, "redirection" in practice means you get a comment "This question is outside of the scope, you could try in SuperUser", and the original thread gets closed. Commented Sep 5, 2021 at 22:55
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    chainloader /EFI/Microsoft/Boot/bootmgfw.efi would be the GRUB configuration line that fires up the Windows boot manager on the ESP partition. NTLDR is for Windows XP and older only. But bootmgfw.efi requires a number of other files to accompany it, and one of them is BCD which needs to be tailored for your installation. The repair tools on the installation media should be able to do it. Commented Sep 5, 2021 at 23:23
  • @xpt - please make it a proper answer then and close the question. It is okay to answer ones own question and better than having a link that might die sooner or later. Commented Sep 6, 2021 at 14:06