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Here's how to Fix Bitlocker Error Code 0x80072f9a.

Here are some steps you can take to fix Bitlocker Error Code 0x80072f9a:

1. **Check for updates.** Make sure that your computer is up to date with the latest Windows updates. You can do this by going to Settings - Update & Security - Windows Update and clicking Check for updates.
2. **Restart your computer.** Sometimes a simple restart can fix minor problems with Bitlocker.
3. **Run the Bitlocker troubleshooter.** Windows includes a troubleshooter that can help you fix problems with Bitlocker. To run the troubleshooter, go to Settings - Update & Security - Troubleshoot - BitLocker Drive Encryption and click Run the troubleshooter.
4. **Disable Bitlocker and then enable it again.** To disable Bitlocker, go to Control Panel - BitLocker Drive Encryption and click Turn off BitLocker. To enable Bitlocker, go to Control Panel - BitLocker Drive Encryption and click Turn on BitLocker.
5. **Reinstall Bitlocker.** To reinstall Bitlocker, you will need to create a new recovery key. You can do this by going to Control Panel - BitLocker Drive Encryption and clicking Create a recovery key. Once you have created a new recovery key, you can reinstall Bitlocker by going to Control Panel - BitLocker Drive Encryption and clicking Turn on BitLocker.
6. **Contact Microsoft support.** If you have tried all of the above steps and you are still getting Bitlocker Error Code 0x80072f9a, you can contact Microsoft support for help.

i. To reset your BitLocker recovery key, you will need to create a new one. You can do this by following these steps:

1. Open Control Panel.
2. Click on BitLocker Drive Encryption.
3. Click on the drive that you want to reset the recovery key for.
4. Click on the link that says "Create a recovery key."
5. Follow the instructions on the screen to create a new recovery key.

Once you have created a new recovery key, you can delete the old one. To do this, follow these steps:

1. Open Control Panel.
2. Click on BitLocker Drive Encryption.
3. Click on the drive that you want to delete the recovery key for.
4. Click on the link that says "Delete recovery key."
5. Follow the instructions on the screen to delete the old recovery key.

It is important to note that you will not be able to access your encrypted data if you lose your recovery key. Therefore, it is important to keep your recovery key in a safe place.

ii. There are a few things you can do to fix a BitLocker error. Here are some steps you can take:

1. **Check for updates.** Make sure that your computer is up to date with the latest Windows updates. You can do this by going to Settings - Update & Security - Windows Update and clicking Check for updates.
2. **Restart your computer.** Sometimes a simple restart can fix minor problems with Bitlocker.
3. **Run the Bitlocker troubleshooter.** Windows includes a troubleshooter that can help you fix problems with Bitlocker. To run the troubleshooter, go to Settings - Update & Security - Troubleshoot - BitLocker Drive Encryption and click Run the troubleshooter.
4. **Disable Bitlocker and then enable it again.** To disable Bitlocker, go to Control Panel - BitLocker Drive Encryption and click Turn off BitLocker. To enable Bitlocker, go to Control Panel - BitLocker Drive Encryption and click Turn on BitLocker.
5. **Reinstall Bitlocker.** To reinstall Bitlocker, you will need to create a new recovery key. You can do this by going to Control Panel - BitLocker Drive Encryption and clicking Create a recovery key. Once you have created a new recovery key, you can reinstall Bitlocker by going to Control Panel - BitLocker Drive Encryption and clicking Turn on BitLocker.
6. **Contact Microsoft support.** If you have tried all of the above steps and you are still getting a Bitlocker error, you can contact Microsoft support for help.

Here are some additional tips that may help you fix a Bitlocker error:

* Make sure that your computer meets the minimum system requirements for Bitlocker.
* Close any other applications that are running in the background before starting Bitlocker.
* Verify the integrity of your Bitlocker installation.
* Try starting Bitlocker in Safe Mode.
* Update your BIOS.
* Contact your hardware manufacturer for support.