I have downloaded city navigator europe NT 2015.20 for use on my nuvi 760, and there is two folder Addition files & Unlocked IMG, in Addition files folder is two file .jcv, D2504170A.jcv about 690MB and D3084140A.JCV about 320MB, what is the difference, does this file compatible with Nuvi 760 and where to put this .JCV, also file with name D2331180A.G2S what is this, and + two folder's ASR and SQlite?
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