OK, how I did it...
1) I dug out my Buffalo Ethernet Bridge, plugged into my laptop and made a note of the IP address.
2) Plugged Bridge into Sat box Ethernet port.
3) Flashed to latest Helios ( previously downloaded) and set up Network as LAN.
4) I was then able to download the EM28, WiFi Drivers etc. for the Solo2.
5) Did a FTP of my Terrestrial settings, Picons Etc.
6) Job done but very fiddly!
My only concern now is that when checking for any updates the box freezes.