This has been bugging me for weeks, i tried ignoring it from the back of my mind but i just cant make at peace with it. Why? cuz all my significant data are in my 320GB which is now inaccessible..

The Windows 10 boot and shared data partitions somehow got encrypted with Bitlocker (and thus are inaccessible from the Win 8.1 install) after a repair shop swapped the motherboard.

Microsoft has fixed a known issue causing some Windows devices to boot into BitLocker recovery after installing last month's Windows security updates. Those affected by this are prompted to enter ...

Microsoft has disabled a fix for a BitLocker security feature bypass vulnerability due to firmware incompatibility issues that were causing patched Windows devices to go into BitLocker recovery mode.

As BitLocker requires Secure Boot, Lambertz also had to start the Linux used for the exploit with Secure Boot. Lambertz emphasized that Microsoft has been aware of the problem for a long time.