I have updated my Two Garmin Nuvi 855 thru Garmin's WebUpdater, and got updated from Software Version 4.60 to Version 4.70. My unit numbers are 36XXXXXXX, which may explain why I do not get Software Version 4.80 as per above unit with unit number 35XXXXXXX. But I still get the FREEZING problem almost every time I start my trip for the first 3-5 minutes after which I had to pull out the battery to reset, very inconvenient while driving!. If Software Version 4.8 will get rid of this freezing problem I would like to get it too. But how can I?