Here are the steps you need to take if you need to start your Windows OS in "Safe Mode" when the drive is protected with BitLocker.
  • First, be sure you have your BitLocker recovery key handy. This is NOT your PIN. This is a LONG series of numbers.
  • Before the screen appears prompting for the BitLocker PIN, press [F8] (maybe repeatedly).
  • If you pressed [F8] early enough, you will get a warning message as seen here:
  • After supplying the BitLocker recovery key, you will be prompted with booting options, including the various safe modes.