Let me explain my experience: I installed a jpn fw on my nuvi 1390 and used it for 2 months without problems, but suddenly he crashed and was a huge choke. I already gave my nuvi as lost, but I finally got save him with the help of Alexander2010 and his miraculous cure, although he stayed with a sequel: the battery no longer retained charge even being new. I've done countless tests on my gps, but installing the jpn firmware in 13xx does not seem an safe idea ...
I've seen 13xx with route, ie, there who knows enable this feature in firmware. Although these models are already off line, are still widely used in many countries. Let's hope that one day this expert can reward us with this feature.
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