Here is the harsh truth: Qualcomm stopped supporting Atheros Bluetooth chips years ago. You have three viable sources:
To install or update the , you should prioritize official manufacturer support pages, as Qualcomm (Atheros) does not provide direct consumer downloads. 1. Identify Your Official Support Source
A $5 USB Bluetooth 5.0 dongle (e.g., TP-Link UB500, ASUS BT500) completely bypasses the internal Atheros module. Just disable the internal Bluetooth in Device Manager and plug in the dongle.
: Some older "Atheros Bluetooth Suites" may be flagged as incompatible during a Windows update. In most cases, Windows 10 will automatically install a basic functional driver even if the original software suite is removed.