Unable to boot windows10, converted from mbr to gpt – hdd does not show up under UEFI boot devices

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For Windows11 prep, I am trying to convert my hdd to gpt on my Windows10 system.
After the conversion, I am unable to boot from the hdd – it does not show up in the list of UEFI boot devices. I do have two hdd’s and am experimenting on the backup hdd.
I have an older PC, an HP Elite 800G1 tower.
This is what I have done so far:

  1. Deleted the duplicate unused Windows recovery partition (as I had 4 partitions)
  2. Ran mbr2gpt to convert to GPT – Ran ok and diskpart showed it was now GPT
  3. HP BIOS boot menu does not show the hdd as a boot option (and it no longer boots as legacy)
  4. I then followed the instructions from SU: GPT drive not showing up as UEFI in bios:
    • Deleted and recreated the EFI partition using diskpart
    • re/set the correct GUID with diskpart
    • booted windows recovery disk and used bcdboot to install bootloader files
    • disk still does not show up in UEFI boot options

Here’s a screen shot of the drive from Macrium Reflect (I note it no longer has a named EFI partition, as it did at step 2 above):

macrium reflect

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