While currently owning and regularly using two Nuvi’s - a Nuvi 3490LMT and a 1260T – I decided recently to add a 2015 Australia purchased Nuvi 57LMT to the collection, knowing full well the current issues with GMA protection on this model.
I have followed with interest the various threads where Forum members have been able to overcome the Garmin GMA protection on recent Nuvi models and successfully download unlocked maps onto their Nuvi devices ...