It sounds like st5 is looking for wpa6.sh (wp6/wp6.sh at master · hak5darren/wp6 · GitHub).
moebius, thanks for the guide. I am really considering an AR150, since the TP-Link MR3020 w/ MK5 I currently use is rather … flakey. It seems to randomly deinitialize anything I connect to the USB port, which are an external wifi stick (TP-Link TLWN722N) and USB storage for extroot. Because it drops the extroot, the device has a kernel panic and reboots.
Did you perhaps test the AR150 with more than 1 USB device?