Hi @Josse
Are you looking to update/manage the content on your RIDER 550?
All the updates for the WiFi models are performed using the WiFi. However, if you still to connect it to a computer and see the steps advised in this article
When the battery of my TomTom Rider 400 drains I have to go to the TomTom Services menu and select the 'Connect to MyDrive' option and log in to get it to talk to my laptop and phone.