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Table of Contents: Introduction Make sure the TPM is Activated Clear the TPM Check your Hard Disk Drive Boot Sector
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Introduction A TPM error has been reported during the BitLocker encryption startup. The error that is reported is that a required TPM measurement is missing . The guide below takes you through the steps that are required in order to resolve this particular error. If the issue persists, there is a further section of troubleshooting that should resolve the problem. Back to Top Ensure that the TPM is Activated The important thing to start with is to ensure that you are on the latest BIOS revision for your particular system. You can get the latest BIOS driver for your particular machine from the Dell Support Site: Make sure you enter either a service tag or express service code from your system or select your system type from the list provided. Go to the Drivers section of the on page menu. The left side tab shows you the updates needed based on the tag or code you used. The right side tab lets you find the update yourself, if you only selected the system type. Ensure that your operating system is selected from the drop-down. Go down the page until you get to the BIOS drawer, select the driver kept there. You can compare the revision of the file against the revision of the BIOS which is shown on the BIOS front page. To run the file, ensure that the personal computer is connected to mains power and double-click the file. Your personal computer restarts. When it has booted back into the operating system, you have updated the BIOS revision. Updated from the file you saved and ran. NOTE: The easiest and quickest way to get into the BIOS on a Dell system is to: Tap rapidly on the F2 key when you see that the Dell Splash screen appears during POST. Alternatively you can tap rapidly at the F12 key at the same point and select BIOS/Startup from the onscreen menu that appears. You can check the TPM status in several ways: Checking within the BIOS Checking from within Windows Checking within the BIOS Once inside the BIOS we must confirm something: Go to Security TPM Security. Ensure the checkbox for Activate is selected. Save and Exit from the BIOS. Checking from within Windows You can access and check the status of the TPM from within the Windows Operating Systems: You can press the Win+R keys together as a shortcut to open a run box in most Windows Operating Systems. Type TPM.msc in the run box and press the Enter key. A management console opens up. You can tell from the front page of the module if the TPM is activated. If not, you can activate it from here as well. Back to Top Clear the TPM NOTE: During the TPM mode change, the TPM firmware update utility warns you that data stored in the TPM will not be retained. The TPM owner should be cleared. Data that may be erased during this: BitLocker Protection Keys BitLocker TPM key protection may be suspended temporarily using the manage-bde.exe -disable switch, without decrypting the contents on the encrypted drive. The BitLocker TPM key protector can be reenabled after the mode change manually or by specifying several reboots before the OS automatically reenables the TPM protector. Virtual SmartCard configuration (enterprise Windows 8.x+) Virtual SmartCard for login must be reenrolled after a TPM mode change. Measured Boot remote attestation measurement values (enterprise Windows 8.x+) Measured Boot remote attestation services may need to be reenabled or reenrolled after a TPM mode change, depending on the remote attestation service provider Other secrets stored by TPM-capable software (such as Dell Data Protection) The next step is to clear the TPM. There are several ways to accomplish this: From within BIOS From within PowerShell From within a Windows Operating System From within BIOS Reboot your personal computer Tap rapidly on the F2 key when you see the Dell Splash screen as it starts up. Go to Security TPM Security . Click the checkbox marked clear or deactivate . Exit the BIOS, saving your settings. From within PowerShell Run this command from the Command Prompt: powershell clear-TPM From within a Windows Operating System You can access and check the status of the TPM from within the Windows Operating Systems: You can press the Win+R keys together as a shortcut to open a run box in most Windows Operating Systems. Type TPM.msc in the run box and press the Enter key. A management console opens up. Under the Actions section on the right, click Clear TPM . In the Clear the TPM Security Hardware box, check next to I do not have the TPM owner password and click OK . You are asked to Reboot. After the Dell POST screen, you will be prompted to press a key ( usually F10 ) to clear TPM . Press that key . Once the system reboots, you are prompted to restart and follow the instructions to enable TPM . Restart. After the Dell POST screen, you will be prompted to press a key to enable TPM. Press that key ( usually F10 ). Once back at the desktop, the TPM Setup Wizard appears for you to enter a TPM owner password . Once you have successfully cleared the TPM, you can check if this has resolved your problem: Open the TPM management console in Windows, it should report that the TPM is ready for use . Turn on BitLocker encryption, does the encryption finish successfully or fail with the same error a required TPM measurement is missing . If the Encryption finishes successfully, then the issue is resolved . If the same error occurs, then use the next section to troubleshoot this further. Back to Top Check your Hard Disk Drive Boot Sector If the error a required TPM measurement is missing persists, the next step is to attempt recovery of your hard drives boot sector. Windows 7, 8, and 8.1, could install on a Legacy BIOS using MBR. However, Windows 8, 8.1, and 10 were designed to install on the UEFI BIOS using the EFI bootloader and GPT. NOTE: Any repairs that are done to the root of a hard drive have the possibility that the repair may go wrong. This means that you would lose any data on the drive that is not previously backed up. Best Practice is always to have performed a full backup of a drive before you work on it or it is operating system. The nt60 switch applies the [newer] boot code for BOOTMGR . SYS updates the primary boot code on the partition that is used to boot Windows. For Hard Disk Drives using MBR The steps are similar, but there are differences between Operating System types. Windows 10 Windows 8 and 8.1 Windows 7 Windows 10 This Operating System uses GPT and the UEFI BIOS, rather than the MBR and Legacy BIOS. Try encrypting using BitLocker again and if your issue with the same TPM error continues past this, then contact technical support for further help. NOTE: There is no Bootsect command for GPT . The GPT structure deals with a lot of the problems that Bootsect was designed to remedy. So there are no instructions on how to use this command. However if you find yourself in need of repairing the EFI bootloader , you can follow the instructions in the article How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10 on your Dell PC . Windows 8 and 8.1 If you do have the Installation Media: Insert the Media (DVD/USB) in your personal computer and restart . Boot from the media. Select Repair Your Computer . Select Troubleshoot . Choose Command Prompt from the menu. Type and run the command: bootsect /nt60 sys If you do not have the Installation Media: Restart your personal computer Tap rapidly on the F8 key once the personal computer has turned on, but before the Windows Splash Screen appears. Be aware this may take several attempts. The timing for this option was shortened significantly from that in Windows 7. Select Repair your computer from the menu that appears. Select Command Prompt from the Troubleshoot screen. Type and run the command: bootsect /nt60 sys Windows 7 If you do have the Installation Media: Insert the Media (DVD/USB) in your personal computer and restart . Boot from the media. Select Repair Your Computer . Select the operating system and click next . Choose Command Prompt from the menu. Type and run the command: bootsect /nt60 sys If you do not have the Installation Media: Restart your personal computer Tap rapidly on the F8 key once the personal computer has turned on, but before the Windows Splash Screen appears. Select Repair your computer from the menu that appears. Select Command Prompt from the Recovery Options . Type and run the command: bootsect /nt60 sys Back to Top
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