If you do not perform this switch, nvflash will return the error: usb device not found despite the device being physically connected.
When an officer presses the PTT, a low-voltage signal is sent to the radio's CPU. The CPU then engages the driver switch, which routes power from the battery to the RF power amplifier. Simultaneously, the antenna relay (a form of driver switch) disconnects the speaker and connects the antenna to the amplifier. apx driver switch