CSR Harmony Wireless Software Stack 2.1.63.0 Download Guide (2026 Update)

After installation, open Device Manager to ensure the CSR device is listed under "Bluetooth" or "Universal Serial Bus controllers" without any yellow exclamation marks. Windows 10/11:

If you are trying to connect Bluetooth devices like headphones, speakers, or mice to an older PC—or using a CSR 4.0 USB Bluetooth dongle—you may need the CSR Harmony Wireless Software Stack 2.1.63.0

CSR Harmony is a software package developed by Cambridge Silicon Radio (now part of Qualcomm) that enables Bluetooth connectivity on Windows PCs. The 2.1.63.0 version is a widely used, stable version known for supporting Bluetooth 4.0 and higher, including aptX audio for higher-quality sound. Key Features: Broad Profile Support: