Just google zumo screen replace it was big talk on another GW forum
and then look at images and you will see the photo on how to replace
I think the screen on the 660 wash out in the sun worst than the 550,
some time I have to pair my phone more than once on the 660, on the 550 paired it once
in 5 years, the screen comes from hong kong takes a week but they say
17 days.