If you're refering to upgrading your Navigation software, QuickGPSfix data and/or your current (out-dated) map, you can do it by connecting to the TomTom website (www.TomTom.com) using the TomTom HOME or MyDrive Connect software, depending on the model/version of your GPS device.
If you're refering to upgrading your GPS hardware/equipment, to have more capability/features, the device is not hardware upgradable, except for adding/using an SD card with a higher storage/memory capacity (to store more info/maps, etc.) ... provided you have a GPS device with an SD card slot.
You'll want to consider buying a newer model with more capabilities / features than what you have now.
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