Hi there! I have tried searching the forum for a link for rolling back the firmware on my nuvi 66lm because i have downloaded the city navigator Europe NT 2015.40 and i have loaded it on my sd card and it wont unlock the maps even though i have used the multiple variety of tools available here to unlock them to no avail. now i have read that rolling back the firmware to remove the new security checks. if someone can point me in the right direction that would be great. Thanks.
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