I tried the given information in this thread but it won't work.
IGO can't find the folders, that is to say the maps.
My SD card has perhaps another adres?

[folders]
content="\SDMMC\Content"
However inside that SDMMC card you'll find a folder OZ.
So it should read something like
[folders]
has_secondary_root=1
secondary_root= "OZ"

If however I change the original map on the device with an XMAP or XNetherlands just to force IGO to look into the SD card, it will fail and can't find any maps.

Tried also this, but still no result.
[folders]
maps="\\SDMMC\OZ\content\map"
buildings="\\SDMMC\OZ\content\building"
dem="\\SDMMC\OZ\content\dem"
maps="\\SDMMC\OZ\content\map"
poi="\\SDMMC\OZ\content\poi"
kmlpoi="\\SDMMC\OZ\content\userdata\poi"

Think the IGO only looked into it's own directory