Windows July security updates send PCs into BitLocker recovery

Microsoft warns that the July 9, 2024 security update (KB5040442) may cause some Windows devices—particularly those with Device Encryption enabled—to boot into the BitLocker recovery screen and require the BitLocker recovery key to continue; affected platforms include multiple Windows 10/11 and Windows Server versions. Microsoft is investigating, provides guidance for retrieving recovery keys via Microsoft accounts and support pages, and notes this is a known update-induced issue rather than an active attack.