After years of wrestling with Garmin's various clumsy attempts at writing update software and then blaming the customer when it doesn't work even after paying rapacious prices for the updates, I stumbled on this website yesterday. In short order, I was able to update my venerable Legend Cx, plus my wife's Nuvi 265WT at no expense.
I can't contribute anything technological here, and don't know when I might be back again, but made a donation to help keep the site going for the next person.
Thankyou to all who can and did contribute.