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6 April 2011, 00:03
Connect your device to computer. In the root directory of TomTom, find a file named ttsystem. Rename it.
Reset your device and connect it to computer and run TomTom HOME.
TomTom HOME would offer you to download the navigation software.
You probably need to restart your device and connect it to TomTom HOME several times until you get the latest version for your device.