Port 1 to Port 3 Error


I just got a problem with one of my VEX IQ brain, that port 1 to port 3 can’t find any devices, and I’m sure my motors and sensors were ok, cause they can work when I connected them to any one from port 4 to port 12. I have updated the firmware in DFU mode, but still not work with port 1 to port 3.

So this brain was broken?