OK. So I hold my hands up here and admit I am stupid but I really need to fix this quickly...
I have wiped it again and let TomTom home do its work and its reinstalled the official NavCore for Go 910. This boots and seems to work although the map isn't supported. I have tried again installing NC 9.510 but I am stuck at the splash screen.
I have tried the automatic Navcore installer which all seems to go ok but hangs at splash screen on boot. I have tried tried the 9.485 automatic installer (same). I have wiped and installed the files manually using an official .cab file from TomTom (same). I have formatted the device under Windows as Fat32 and reinstalled everything but always it hangs at the splash screen.
Please what am I doing wrong?