![]() ![]() Note You can verify the PCR values that are in use on a device by running the following command from an elevated command prompt: For example, you install the Surface dTPM (IFX) update. You install a firmware update that updates the firmware of the device TPM or changes the signature of the system firmware. PCR values have been explicitly defined, such as by Group Policy. This behavior can occur in the following scenario:īitLocker is enabled and configured to use Platform Configuration Register (PCR) values other than the default values of PCR 7 and PCR 11, for example when: Your Surface device appears to be in an infinite reboot loop. ![]() You boot directly into the Surface Unified Extensible Firmware Interface (UEFI) settings. ![]() You encounter one or more of the following symptoms on your Surface device:Īt startup, you are prompted for your BitLocker recovery key, and you enter the correct recovery key, but Windows doesn’t start up. If you implement this workaround, take any appropriate additional steps to help protect the computer. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. You can make these changes to work around a specific problem. Important: This article contains information that shows you how to help lower security settings or how to turn off security features on a computer.
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