Unlike major tech brands like Sony, Bose, or JBL, W-King does not provide a dedicated support page with firmware binaries or a "W-King Connect" app to push updates to the device.
The following appendix provides a detailed guide on how to update the firmware of the W-King D9: w-king d9 firmware update
How to update the firmware on your True Wireless Earbuds - Panasonic Unlike major tech brands like Sony, Bose, or