I also tried connecting the USB type B port to my Mac. I have lsusb installed through homebrew. It does not see any new devices appear when I plug it in.
According to the A603 docs, if I jumper pins 1 and 2 of the 14-pin header, I can put it in recovery mode, but I don’t think that’s what I want. I want device mode.
ifconfig does show a rndis device:
rndis0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether ca:4a:12:13:69:21 txqueuelen 1000 (Ethernet)
...
Is there anything else I could possibly have to do to enable this port?
BTW, I have two A603’s, and both have this same problem, so it’s not a broken board.