Thanks Giomen! I found it!
Now I have another problem:
I want to back up (all) the files of a nuvi 3490 but I cannot see the hidden/system files. I have enabled them in the File manager of Win7 (and I have used Total Commander (another file manager) with hidden/system files enabled but I have the same problem.
I have noticed that the nuvi is shown as a "portable device" which contains "Internal Storage" (i.e. nuvi's internal memory) and "memory Card" (i.e. the microSD card). In the "Internal Memory" I cannot see the hidden/system files. I tried with an older garmin USB driver v3.2 & 2.3.1.1 but I get the same problem.
Any good idea or trick?
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SOLVED
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I found that I need to switch to MTP mode:
Press Upper-Right corner of the volume screen to enter diagnostics Page and then select:
MTP Settings > Mass Storage (instead of default MTP Auto Detect)
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