Meh. I already have that update & my old Logitech BT keyboard & mouse are still working as normal.
It probably only effects dodgy BT equipment.
Anyway here is the Microsoft full detail on the event.
Some Bluetooth devices may fail to pair or connect after applying June 11, 2019 or later updates
Koskee seuraavia: Windows 10, version 1903Windows 10, version 1809Windows Server 2019, all versions
Summary
You may experience issues pairing, connecting or using certain Bluetooth devices after installing security updates released June 11, 2019. These security updates address a security vulnerability by intentionally preventing connections from Windows to unsecure Bluetooth devices. Any device using well-known keys to encrypt connections may be affected, including certain security fobs.
For more information, see .
Next steps
If you experience issues pairing, connecting or using Bluetooth devices after installing any of the affected security updates, please contact the manufacturer of your Bluetooth device to determine if a device update exits.
Advanced users can verify if their device is affected by checking Event Log for the following event:
Event Log System Event Source BTHUSB or BTHMINI Event ID 22 Name BTHPORT_DEBUG_LINK_KEY_NOT_ALLOWED Level Error Event Message Text Your Bluetooth device attempted to establish a debug connection. The Windows Bluetooth stack does not allow debug connection while it is not in the debug mode.
Affected updates
The following latest cumulative update (LCU) and Monthly Rollups released on June 11, 2019 or later for the affected platforms will experience the new behavior:
- or later LCU for Windows 10, version 1903.
- or later LCU for Windows 10, version 1809 and Windows Server 2019.
- or later LCU for Windows 10, version 1803.
- or later LCU for Windows 10, version 1709.
- or later LCU for Windows 10, version 1703.
- or later LCU for Windows 10, version 1607 and Windows Server 2016.
- or later LCU for Windows 10, version 1507.
- or later Monthly Rollup for Windows 8.1 and Windows Server 2012 R2.
- or later Monthly Rollup for Windows Server 2012 and Windows Embedded 8 Standard.
The following Security Only updates are also affected:
- for Windows 8.1 and Windows Server 2012 R2.
- for Windows Server 2012 and Windows Embedded 8 Standard.
Source:
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