Success! I rebooted and restarted everything including a reset on the connexx air and followed the instructions. Once I connected the connexx to USB I was able to install the firmware update to 2.6, and could then detect my Silk 7x and read the setting info
I have not done anything to adjust them yet, but the existing setup by my audiologist seems to be just a simple Signia first fit! No wonder I have not been very happy with them