Specifically, how the device's Credential Guard is configured and whether you've already installed the update. There is a workaround available for the BitLocker recovery mode, but it depends on the device configuration. If you encounter this error, you should consult the Microsoft BitLocker recovery key guide. The BitLocker recovery mode bug is affecting multiple Windows versions: Setting this policy may result in BitLocker recovery when the firmware is updated. This prevents BitLocker from using Secure Boot for platform or Boot Configuration Data (BCD) integrity validation. Specifically, setting this policy with PCR7 omitted, will override the Allow Secure Boot for integrity validation Group Policy. If BitLocker Group Policy Configure TPM platform validation profile for native UEFI firmware configurations is enabled and PCR7 is selected by policy, it may result in the BitLocker recovery key being required on some devices where PCR7 binding is not possible. You can read the full Microsoft Security Update blog for more information. When triggered, it causes the BitLocker recovery mode function to run, which requests your BitLocker recovery key. However, a side effect of the KB4535680 security update was the accidental introduction of a bug affecting BitLocker. Its primary role is to protect against dangerous malware types, such as rootkits and bootkits. The original update was a security update designed to resolve an issue with Secure Boot, a security feature that blocks untrusted operating systems from booting on your computer. The KB4535680 update was released to Windows systems in January 2021. The bug was introduced to Windows 10 as part of a recent update that addressed a Secure Boot vulnerability. Microsoft is working to fix a Windows 10 bug that triggers BitLocker's recovery mode.

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