Here is my information again here to help you, if you did not get it in other post you made. Thanks Mike.
Hello Here is some more information for you to follow to guide you step my step.
Device displays a white or red cross
If your navigation device displays a cross after you switch
it on, it means that the TomTom application is not installed correctly.
Note: It is normal for the navigation device to show a cross while it is connected to the computer.
The solution depends on which TomTom software is used for updating.
Check which software your navigation device uses for getting updates.
Devices using MyTomTom for updates
For navigation devices that use MyTomTom, reset your device.
Devices using TomTom HOME for updates
For navigation devices that use TomTom HOME, you can solve this
problem by installing the latest application on your navigation
device.Here is also a link that will help you more. This will answer all
your questions Mike