Lenovo has identified an issue where Microsoft KB3161608 may break Bluetooth functionality on Windows 7 platforms with Intel wireless adapters that use third party supplemental BT profiles. It is known that key Bluetooth features won’t work, including HID, FTP, and A2DP.
When KB #3161608 is installed, the following symptoms have been reported:
The system will not pair with previously-paired Bluetooth devices
Bluetooth Options show grayed-out in Control Panel
Device Manager may show a generic Bluetooth Adapter device with a yellow exclamation point or bang
Error message "Windows has stopped this device because it has reported problems. (Code 43)
Event log shows event ID 17: "The local Bluetooth adapter has failed in an undetermined manner and will not be used. The driver has been unloaded."
Bluetooth Driver installation fails
While this KB is currently listed as an optional download in Windows Update, Microsoft has future plans to upgrade the priority to important soon. As a result, Intel is working with Microsoft to delay the promotion until all mitigations are in place.
If Bluetooth stops working on a system running Windows 7, please check to see if this KB has been installed, and if so, remove it and reboot your system.