Not folder. @arslankayna clear told you - file. Yes, "device.nng" file.
Look if there is subfolder "SAVE" in main folder "NAVI AP" ?
Can you access internal memory of device?
P.S. Can you post structure of files/folders of working Primo at your device? Root, subfolders, all...
Also content of it's sys file?
Note: follow Forum Rules, use spoilers
Or upload whole package from card, but without large content (maps, pois, etc...).



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