Bitlocker: "the startup options on this pc are configured incorrectly" and "tpm is ready for use"

J L 21 Reputation points
2021-02-03T00:32:44.817+00:00

Hello,
I have just upgraded to Windows 10 Pro and am attempting to enable Bitlocker on my main drive "C".
I have checked the TPM and it reports "The TPM is ready for use.". I have also cleared the TPM.
When I then enable Bitlocker, it reports "the startup options on this pc are configured incorrectly".
It should be noted that I have set the "BitLocker authentication requiring preboot keyboard input on slates" to enabled.
Thank you.

Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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Accepted answer
  1. Jenny Feng 14,076 Reputation points
    2021-02-03T02:52:21.477+00:00

    @J L
    Hi,
    Does BIOS have Legacy options enabled? That may need to be disabled and changed over to UEFI to allow secure boot of the OS.
    https://learn.microsoft.com/en-US/troubleshoot/windows-client/windows-security/tpm-is-ready-for-use-with-reduced-functionality

    Also, run gpedit
    Local computer policy> computer configuration > administrative templates > Windows Components > bitlocker drive encryption > Operating system drives

    Require additional authentication at startup

    Enable it, then open up a command prompt and run a gpupdate /force

    Hope above information can help you.

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  1. J L 21 Reputation points
    2021-02-03T11:00:40.977+00:00

    Hi, thank you for your response. When I change the Boot Device Control from "UEFI and Legacy OPROM" to "UEFI only", the Boot Priority drives (in my case PE: Samsun SSD 850 EVO" disappears and every restart returns to the BIOS and doesn't load the OS.
    Any suggestions?
    I think this may be the problem, but am unsure what my next steps would be. Do I have to obtain device signatures? If so, how? Or are there other steps to take that will allow me to use this TPM?

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  2. J L 21 Reputation points
    2021-02-04T02:48:15.543+00:00

    I have solved this issue thanks to the direction that JennyFeng-MSFT provided.

    In order to allow the BIOS to operate in UEFI without the Legacy support, I had to convert the boot drive (disk) from the Master Boot Record (MBR) to the GUID Partition Table (GPT) partition style. Once this was done, the rest worked like a charm.

    Should anyone find a similarly difficult situation, below are some links that will help:
    https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt
    https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/boot-to-uefi-mode-or-legacy-bios-mode
    https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/winpe-create-usb-bootable-drive

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  3. Jenny Feng 14,076 Reputation points
    2021-02-04T05:51:53.877+00:00

    Hi,
    Glad to hear that you have found a solution and thank you for sharing it here, it will be helpful to other community members who have same questions.
    If the reply helped you, please remember to accept as answer.

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