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Users frequently encounter these issues when updating Windows or reinstalling systems:

If your system is not connected to the internet, you can find drivers on other PCs and transfer them.

When connecting to a new device, the default passcode for the AR5BBU12 is often 0000 . If that fails, check the documentation of the device you are connecting to.

built in atheros bluetooth completely unrecognized ! - Microsoft Q&A

If the standard executable doesn't work, follow these manual steps to ensure the module is recognized: Super Userhttps://superuser.com How do I enable Bluetooth with my Qualcomm Atheros adapter?