The tool interface should display a green light or a "Device Connected" status message.
Improperly flashing firmware can "brick" your speaker, rendering it completely unresponsive. Before attempting any update, ensure you meet the following conditions: W-king D8 Firmware Update
Updating firmware carries a small risk of bricking your device if interrupted. Before you begin, ensure you meet the following requirements: The tool interface should display a green light
This indicates a "brick" caused by flashing the incorrect hardware revision firmware. Reach out directly to W-King customer service with your serial number to request the original stock firmware recovery file. W-king D8 Firmware Update