To help give you the exact steps or files you need, could you tell me:

W-King has released a few variations of the D8 over the years, including the standard D8, the D8 mini, and the D8 pro. Ensure the firmware file matches your exact model.

Many USB-C cables only transfer power, not data. Switch to the original cable that came with the speaker or a high-quality data cable.

Resolves issues like the speaker not responding, buttons not working, or unexpected shutdowns.

: Entering "Device Firmware Upgrade" (DFU) mode is the most technical hurdle. It usually requires a specific sequence of holding the Play and Power buttons while the device is off.

Press and hold the button for approximately three seconds. While still holding Play, press the Power button.