Hiding the TPM from the operating system.Upgrading critical early startup components, such as a BIOS or UEFI firmware upgrade.Upgrading the motherboard to a new one with a new TPM.Turning off, disabling, deactivating, or clearing the TPM.Changes to the NTFS partition table on the disk.Docking or undocking a portable computer.Having the CD or DVD drive before the hard drive in the BIOS boot order (common with virtual machines).Turning off the support for reading the USB device in the preboot environment from the BIOS or UEFI firmware if using USB-based keys instead of a TPM.The following list provides examples of common events that cause a device to enter BitLocker recovery mode when starting Windows: This article describes scenarios that trigger BitLocker recovery, how to configure devices to save recovery information, and the options to restore access to a locked drive.
BitLocker recovery is the process by which access to a BitLocker-protected drive can be restored if the drive doesn't unlock using its default unlock mechanism.
