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

Discussion in 'Windows Guest OS Discussion' started by Mark Fine, Sep 25, 2021.

  1. macsrwe

    macsrwe Bit Poster

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    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?
     
  2. JohnJohnD

    JohnJohnD Bit Poster

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    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!
     
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  3. Consonanza.

    Consonanza. Bit Poster

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    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?
     
  4. Mark Fine

    Mark Fine Kilo Poster

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    480
    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.
     
  5. JohnJohnD

    JohnJohnD Bit Poster

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    @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.
     
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  6. Rossh51

    Rossh51 Bit Poster

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    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?
     

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  7. Rossh51

    Rossh51 Bit Poster

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    Simething strange here based on further investigation. Disk appears to be GPT but partitions are MBR. Abyone assist?
     
  8. JayV4

    JayV4

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    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?


    upload_2022-9-21_22-12-39.png
     

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