The speaker must typically be connected via a USB-C data cable to a computer to interface with the flashing software.
Users must follow the specific button-press sequences (often involving the power and EQ buttons) to put the device into "Update Mode" before the PC can recognize the hardware. Risks and Precautions How to Update W-King D9-1 firmware? : r/Bluetooth_Speakers w-king d9 firmware update
The following appendix provides a detailed guide on how to update the firmware of the W-King D9: The speaker must typically be connected via a
W-King does not support over-the-air (OTA) updates. You must perform the update manually via a Windows PC and a USB cable. w-king d9 firmware update