How to enable system extensions on Apple Silicon M1 Mac?

Step 1: When installing M3 BitLocker Loader for Mac on Apple Silicon M1 Mac, you need to allow system extensions before reading/writing BitLocker encrypted drive.

It is a necessary step on M1 Mac and won't lower your Mac security. After enabling system extensions, you can restore "Security Policy..." to the original setting.

Step 2: After opening security preferences panel, click "Lock" button to unlock the settings.

Step 3: Click "Enable system extensionss...".

Step 4: Click "Shut down".

Step 5:When you turn on your Mac, continue to press and hold its power button for at least 10 seconds, you will see the following window. Then click "Options" to continue.

Step 6: Select "Startup Security Utility" from Utilities menu.

Step 7: Click "Security Policy...".

Step 8: Check "Reduced Security" option and "Allow user management of kernel extensions from identified developers", then click Ok.

Step 7: Restart your Mac.

Step 8: Click "Allow" option in Securtiy Preferences settings to allow system extensions.

Then you can use M3 BitLocker Loader for Mac to open a BitLocker encrypted drive on Mac

Step 9: Restart your Mac, continue to press and hold its power button for at least 10 seconds, you will see the following window. Then click "Options" to continue. Follow the above step 6 and step 7 to restore the security policy to Full Security option.