To make sure this is the right fix for your device, check if these points are correct for you:
1. You can get working TMC with a different NC
2. NC 9.4xx does not find a signal to update the traffc info but shows the traffic bar on the screen
3. You have done a proper and clean installation of the 9.4xx
4. Your device is compatible with the NC - that means Home would offer you the NC as an update! and runs the correct emulation for your device (E.g.: a 730 in X30 Emu and a 720 in X20 Emu)

Only if the above 3 points are true in your case you can proceed, if one or more points are not true your problem might be elsewhere!\