I have a Woot refurbished 510 that works perfectly so far. I transferred the maps and apps to a 2 gb sd card and all works fine except when I use it at Tomtom Home it calls it a 710 and I cannot change it .I've tried changing it from the device tab ,but it doesn 't give me that option. When I put the original card back in it calls it a 510 again. Any solutions or should I just not be concerned about it? Redman 92