Often in such cases when you cannot see the file system of the PNA, the navigation is called from the .ini file on the SD card. For example if you copy Primo folder to SD card and the executable is Primo.exe you should manually create file shell.ini or GpsShell.ini (or you can try with both at the same time) and manually set the path to .exe file inside that file. Check the attachment. Extract and copy both files to the SD root beside the Primo folder. If that doesn't work, open both .ini files and try to replace "SDMMC" with "Storage Card"

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