KB4507435 addresses an issue in Windows 10 Obtober 2018 Update that causes BitLocker to go into recovery mode.
Release date: July 9, 2019
Version: OS Build 17134.885
Applies to: Windows 10 version 1803
KB4507435 brings security updates to many Windows components and apps, such as Windows Wireless Networking, Microsoft Scripting Engine, and Microsoft Edge.
How to get this update:
Windows Update will automatically download and install this update.
Go to Settings > Update & Security > Windows Update and select Check for updates
Get the standalone package for this update from Microsoft Update Catalog
Issues reported for this update:
Some operations may fail with the error “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”.