W-king D9 Firmware Update – Verified Source

Use a high-quality USB-A to USB-A data cable.

: While both EQ modes benefit, "EQ1" (typically the indoor/balanced mode) shows the most noticeable improvement in general general audio quality. w-king d9 firmware update

firmware update process typically requires manual intervention using a specific PC tool, as older versions of this speaker do not support over-the-air (OTA) updates through an app Direct Update Instructions To update your Use a high-quality USB-A to USB-A data cable

: Newer models like the X20 and D320 are compatible with the official W-KING Audio App , which allows for easy firmware upgrades and EQ adjustments. w-king d9 firmware update

has been a manual task involving a Windows PC and a specific software tool, rather than an over-the-air (OTA) update through a mobile app.