Process for Converting from Legacy to UEFI (in prep for Win 11)

Furthermore, on a separate machine with Parallels and running an unrelated VM created fresh with Windows 10 (not upgraded), the first partition begins in exactly the same place. So now I am wondering why many more people are not seeing this error when trying to perform this process?

 

Just wanted to say that the original procedure posted here worked great on two different Win10 VMs on two different Macs, thank you @Mark Fine!

 

Now that Paralles has introduced the facility to add TPM within its software (see https://kb.parallels.com/en/122702), does this mean that the procedure outlined above is now redundant?

 

I doubt it. The software has always had a facility to add TPM. I just didn't work in many instances because Windows itself wasn't prepped properly.

 

@Consonanza., @Mark Fine is correct: this thread isn't about adding TPM per se, but rather converting from Legacy to UEFI with existing VMs. You'll see a section at the bottom of that article under Troubleshooting called TPM chip is not on the list, and you'll see that the article says to just create a new VM (i.e. not use your existing VM with all your data in it!). That's the case where the procedure that @Mark Fine created solves a problem.

 

I am getting a failure to validate when running the mbr2gpt utility, presumably because I have 4 partitions ... see screen shot. When I go to delete one (This is a test VM) I get a message, as per screenshot that the partition is related to other systems on the disk. I am concerned I may wreck my Mac disk. Admit I don't understand what the Disk Mgmt utility is looking at. Are all these partitions within the VM or am I at risk here deleting partitions?

 

Simething strange here based on further investigation. Disk appears to be GPT but partitions are MBR. Abyone assist?

 

I've run through the procedure twice (got the RE error as described but all else was as expected). Both times, the VM does not boot and I get the below. I also added "vm.bios.efi=0" under advanced in Boot Options. I'l running Parallels 18. Any thoughts?

 

Same for me. No Issues. Many thanks to Mark and Brian.