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Update bitlocker-recovery-guide-plan.md

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Siddarth Mandalika
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windows/security/information-protection/bitlocker/bitlocker-recovery-guide-plan.md
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@ -274,15 +274,6 @@ This error occurs if you updated the firmware. As a best practice, you should su
Windows Recovery Environment (RE) can be used to recover access to a drive protected by [BitLocker Device Encryption](bitlocker-device-encryption-overview-windows-10.md). If a PC is unable to boot after two failures, Startup Repair automatically starts. When Startup Repair is launched automatically due to boot failures, it executes only operating system and driver file repairs, provided that the boot logs or any available crash dump points to a specific corrupted file. In Windows 8.1 and later versions, devices that include firmware to support specific TPM measurements for PCR\[7\] **the TPM** can validate that Windows RE is a trusted operating environment and unlock any BitLocker-protected drives if Windows RE has not been modified. If the Windows RE environment has been modified, for example, the TPM has been disabled, the drives stay locked until the BitLocker recovery key is provided. If Startup Repair is not able to be run automatically from the PC and instead, Windows RE is manually started from a repair disk, the BitLocker recovery key must be provided to unlock the BitLocker–protected drives.
### <a href="" id="bkmk-changebootknown"></a>Changes to boot files
This error might occur if you updated the firmware. As a best practice, you should suspend BitLocker before making changes to the firmware and then resume protection after the update has completed. This action prevents the computer from going into recovery mode. However if changes were made when BitLocker protection was on, then log on to the computer using the recovery password, and the platform validation profile will be updated so that recovery will not occur the next time.
## Windows RE and its usage in BitLocker Device Encryption
Windows Recovery Environment (Windows RE) can be used to recover access to a drive protected by [BitLocker Device Encryption](bitlocker-device-encryption-overview-windows-10.md). If a PC is unable to boot after two failures, Startup Repair will automatically start. When Startup Repair is launched automatically due to boot failures, it will only execute operating system and driver file repairs, provided that the boot logs or any available crash dump point to a specific corrupted file. In Windows 8.1 and later, devices that include firmware to support specific TPM measurements for PCR\[7\] the TPM can validate that Windows RE is a trusted operating environment and will unlock any BitLocker-protected drives if Windows RE has not been modified. If the Windows RE environment has been modified, for example the TPM has been disabled, the drives will stay locked until the BitLocker recovery key is provided. If Startup Repair can't run automatically from the PC and instead Windows RE is manually started from a repair disk, then the BitLocker recovery key must be provided to unlock the BitLocker–protected drives.
Windows RE will also ask for your BitLocker recovery key when you start a "Remove everything" reset from Windows RE on a device that uses the "TPM + PIN" or "Password for OS drive" protector. If you start BitLocker recovery on a keyboardless device with TPM-only protection, Windows RE, not the boot manager, will ask for the BitLocker recovery key. After you enter the key, you can access Windows RE troubleshooting tools or start Windows normally.
The BitLocker recovery screen that's shown by Windows RE has the accessibility tools like narrator and on-screen keyboard to help you enter your BitLocker recovery key. If the BitLocker recovery key is requested by the Windows boot manager, those tools might not be available.