As far as I remember enabling features worked with 3490 fw version 3.60.
Not tested with other fw versions by me.
I'm not sure, but I think enabling features by using xml files doesn't work with nuvi 3790. Only by patching (modifying) region 140.
The whole device memory is divided into some regions. Region 140 is a part of the whole system.
Somewhere in this forum is a topic about executing code from SD card. At this topic is explained about regions.
This this topic is here:
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