Step by step instructions are here:
TUTORIAL: Clean Install - How to install the latest map and navcore from scratch!
Map thread finder for the v885 maps:
Find a map that fits in your device and of course one that is compatible with your navcore - (look at the compatibility charts mentioned in the tutorial).
From the information you've given, your navcore version is 8.083 and any of the following maps are compatible:
Use FastActivate Premium to activate/patch everything.