My Garmin experience today:
My 550 will only show the logo screen for about 8 seconds before switching itself off and if plugged into the computer it’ll go as far as “Preparing to enter USB mass storage mode/ saving all waypoints...in GPX mode 1%” then it freezes...
Having read this thread I joined Zumo forums, read all I could and tried all suggestions but no joy. So I phone Garmin UK and, after 48 minutes on hold, I got to speak to a guy who diagnosed the problem as being the battery “at least” as being dead. But that was the end of it: they won’t accept it back as they “Don’t have any batteries” and even if I sourced one elsewhere I’d “Be unable to get any further support from them as they don’t offer a repair on 550’s any more”.
I did ask if there would be any ‘goodwill’ shown if buying a new model but the answer was “Sorry, no: it’s six years old - if it was newer then we can do something but not for that age”.
R