If the autorun fails:

: If the installer (.exe) doesn't work, you must manually point Windows to the driver files: Device Manager

If a Windows Security warning appears regarding an "unverified publisher," select "Install this driver software anyway" to complete the process. Method 2: Manual Installation (Device Manager)

. Since this chipset is common in older feature phones or budget devices, finding an official "report" or updated installer can be difficult. Driver Overview RDA USB Driver