The BMS does not respond and it is impossible to connect over USB/WiFi/Bluetooth

Most likely the BMS has entered sleep-mode. Sleep mode is entered when:

• Power is off
• Nothing is connected over USB, Bluetooth or Wifi
• Not balancing
• Not charging
• Block sleep is disabled in the settings

Notice that block sleep is enabled by default, but it will disable itself after a few hours to avoid draining the battery.
In sleep-mode it is not possible to connect to the BMS over USB, Bluetooth or Wifi. To leave sleep mode you can:

• Enable the power output by bridging EN and ENs on the comm-port
• Connect a charger