[veejo]

I'm trying to upgrade the firmware on my nextstar 6se.

I believe this is done by plugging in a 4p4c cable into the handset, and the other end into an db9 rs232, which I have on my PC (real one, not usb convertor).

I've tried to make up one cable from a picture on the internet, uses 3 wires of the 4 tx, rx, gnd i pressume, but no response, just times out (wrong pins on cable or DB9 ??).

Does somebody have the pinouts or a pdf of one they made and knows to work ?

Do I need a null modem ?

can I flash both the base and the handset from the same port on the handset ?

There is an aux port and guide port on the base. Current firmware is a version 4.xx but not latest