I have a Rosen unit in my Toyota Tundra, and i accidentally deleted my card. I wanted to delete the music, but i deleted the navigation system. Now it shows: nngnavi.exe cannot find. Will you guys help me how can i get a free version of it, or Is there other options (I-GO) ???

can you not just use an undelete program?

I don't understand your question. I need a gps and i formated the card. no data on it

He appears to have accidentally deleted all the program files on his SD card which included the gps operating system files

you can use a data recovery software for windows so you can restore your data from sd card

It took me 4-5 days to use a recovery software, it was extremely slow.m Now I have 417mb bou most of them zip files and when i plug it in the head unit, still can't find the directory, not sure how to point on it, or how to start. It did a calibration, than warning message again

So no help here ?