Simply visit Microsoft’s website and sign in using your Microsoft Account to select the Surface device that needs to be reset. Then How to factory reset Surface Pro 4 without BitLocker key If you still cannot get the key, you can try to restore the computer by downloading the recovery image of Surface and create the Surface recovery USB from another computer. And before moving ahead, you can try to get the BitLocker recovery key through the link below before you do a system reset. However, if you forget the BitLocker recovery key, you must go through many obstacles to reset Surface Pro 4 without the BitLocker recovery key. If you have turned on BitLocker encryption on your Surface 4 and now want to reset your device, you must enter the BitLocker recovery key during this process to continue. BitLocker is a very useful feature on Windows, which allows users to easily encrypt drives.