Here is download link for Mitsubishi.gpi if someone want to explore it out (but it's Thai language )
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Does Volvo.gpi works on your 3750?
For me it didn't work on 3790., but works fine on nuvi 775.
Umm., My 3790US converted to CHN2.20 now.
I will try again.
This is from 775., Volvo is perfect.
It works fine now on my 3790.
At first it didn't work because I renamed Mitsubishi.gpi to other name for displaying 2 Mitsu icons.
When I deleted one of Mitsu.gpi --> Volvo.gpi work now.
At first :: I'm not sure where I should place .gpi within Nuvi so I installed in sdcard\poi\volvo.gpi
Then install to internal memory by firmware prompted "Do u want to install" --> Yes
I found that .gpi file was place in NUVI\POI\volvo.gpi