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Bluetooth CSR 4.0 dongle installation - YouTube
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How to check Bluetooth version in Windows 11/10
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Updating to a new version of Windows 10 on devices with some driver versions for Realtek Bluetooth radios - Microsoft Support
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How to check Bluetooth version on Windows 11, 10 - Pureinfotech
Kinivo Btd-400 Bluetooth 4.0 Low Energy USB Adapter Works With Windows 10 8.1 8 for sale online | eBay
