I take it both gps and auto steer are plugged directly into your laptop.
What type of gps are you using? for example I use emlid m2, if I do not use the higher amperage usb 3.0 port and a heavy usb cable for it it has power issues.
Are the leds on your gps staying stable when you plug in the autosteer?
COM ports are ok now, it’s connected. The problem is that Rx led blinks slowly which means that Nano is receiving data, but Tx blinks very fast, different than Rx. On older version, there was written “not connected BN055x…”. Also, how to know that Nano sends data to motor?
Applied 5V on Nano and WAS, and 12V on IBT2 motor driver. I don’t know what you mean for GPS version, but I think all is newest version. RTK board simplertk2b was configured to send only VTG and GGA messages, too.