Configure the following parameters before updating the firmware.

COM port:
Select the COM port by the following procedures.

1 Install a full-charged battery pack to the transceiver.
2 Turn the transceiver power OFF.
3 Turn the transceiver power ON while pressing and holding [PTT] and the [1] key, and place the transceiver in Firmware Programming Mode.
按住PTT 再按住数字键1 然后开机
4 Connect the transceiver’s USB 2.0 micro B port to your PC’s USB port using a USB 2.0 cable.
5 Select the COM port to use from the dropdown list.