They are receiving an error message that Windows cannot verify the digital signature and the driver drops error code 52.
Microsoft A2Dp Source Fix Windows 10 Users SeemIn August 2019 a number of Windows 10 users seem to have been hit.
Microsoft A2Dp Source Fix Driver Drops ErrorMicrosoft A2Dp Source Fix Drivers Required ForThere is error message Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. The error message indicates that Windows cannot verify the digital signature required for the drivers. ![]() It seems as if an unsigned driver (possibly via auto-update) has broken the systems. I mentioned this in the article Windows 10 V1903: Update KB4505903 breaks Bluetooth speaker connection. This is a manufacturer-independent technology that allows stereo audio signals to be sent wirelessly via Bluetooth to an appropriate receiver. A distinction is made between sources (transmitter, source) and sinks (receiver, sink). The source can be a computer or a smartphone; a Bluetooth headset or loudspeaker set, for example, is used as a sink. In the above error pattern, the source in the form of the relevant profile on the Windows 10 computer throws the error. There are two ways to repair or replace the unsigned driver file with Windows 10. To do this, open the Settings app from the Start menu and select the Update and Security Troubleshoot categories. Then select the Bluetooth troubleshooter in the right part of the window and let it run. Maybe this fixes the error in the forum thread linked above, some users have been successful with the troubleshooter. This at least solved the problem for one user (the signed driver was then written back). There are also users who were successful with a driver update. I opened up a new Acer and my Bose bluetooth headphones would connect but my Bose Color Soundlink would not. The system file check, running sfcscannow as the admin did fix the problem.
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