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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.


Additional information can be found here:


**According to Intel, Microsoft KB3172605 may have replaced KB3161608, so be sure to roll back both updates.


9/12/16 EDIT: Lenovo has released additional information in this Service TIP:



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Good afternoon 



Today I am unable to connect the speaker through bluethooth, despite having tried all solutions give. 

Kindly assist. 

Regards Isabel