The current full list of the devices that cannot be modified is below:-
GO 40/50/60/400/500/600/800/1000/1500/2000/5000/6000 Series
GO LIVE Camper & Caravan and Top Gear edition
All Via/Via Live Series
All PRO/PRO Truck series
Start 20/25/60 Series (but NOT the Start Classic, Start, Start²/Start 40/45/50/55 series which still use TTHome)
Blue & Me TomTom 2 LIVE
Sony XNV
TomTom Connect
Social Networking Bookmarks