For “Interface USB” with squared connector I make the weld of wires in the following order.
3 2 1
O O O
O O O
6 5 4
pin 2 O O pin 4
O <------------ pin 6
pin 1 O O pin 5
Red in 3 Pin and Black color in Pin 2. E perfectly functions in the Radio 6Exas.
For “Interface USB” with round connector I make the weld of the Red wire in 2 Pin and the Black color in the external part of the connector.
Sincerely I do not obtain to understand because in some radios it functions and others not being that all are Rádios Futaba.