Hobbywing USB Link Software - Manual (Page 5)

If you want to upgrade or set the ESC, please do as follows:
①Insert the signal wire to the port of the 2 in 1 program box
②Connect the program box to computer by the USB cable
③Connect the battery to the ESC
④Switch on the ESC.
4.3 Upgrade the software of 2 in 1 Program Box
Click “Device” -> “2 in 1 Program Box” -> “Software”, and then choose the
software version you want to upgrade.