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 released out-of-band updates to fix a known issue causing Windows 10 systems to boot into BitLocker recovery after installing the May 2025 security updates.

Fix BitLocker error E_FVE_TPM_NOT_DETECTED, The booting system doesn't have or doesn't detect a TPM in Windows 11/10.

Open the Windows search bar, type "BitLocker," click on Manage BitLocker and open it. Find your removable drive under Removable data drives – BitLocker To Go and select it.

As users of Windows 10 Pro or Enterprise have access to, and will likely use, the full-disk encryption BitLocker feature, Microsoft has acted quickly.

If you see This PC doesn't support entering a BitLocker recovery password during startup, enable WinRE, tweak Group Policy, ...

Are you still typing in all-caps BECAUSE WINDOWS 11 HOME WILL FORCE USERS TO HAVE A MICROSOFT ACCOUNT? Lighten up. One of the features where the MSA will matter is with BitLocker, which encrypts ...

EaseUS Partition Master grants Windows Home users BitLocker management permissions. They are now free to enable or disable BitLocker and manage BitLocker partitions.

Microsoft is warning that modern PCs which support specialized encryption functions for BitLocker and other encrypted drives may be subject to data damage and performance slowdowns.