Ask anyone if they use the built-in sat nav and the answer is always "It's crap I just use Google Maps instead". Side note… it's such a shame to think of the countless hours of dev time wasted on car sat nav systems. I actually came across your blog posts the other day and wondered where you managed to obtain the firmware archive - did you have to go to a Nissan dealership? I also wondered what you used to create your patch - IDA or something similar? It could well be that I didn't prepare my flash drive correctly, although I ran the script/command as per the how-to… I might try again later, though, just in case. I wonder if the fs has been created / written to the usb stick correctly? The D554 firmware was pre-installed, and I haven't yet been able to find any firmware updates available online (although admittedly I wasn't very thorough in my searching). However, I haven't got anywhere on understanding the format yet.ĭo you have access to a copy of the D554 firmware for yours or D605? But that can be worked around if you can get the hack working on your device, see my blog linked on my profile and one of my GitHub repos. If you edit the maps they probably won't work, because the maps are signed. I wonder if the fs has been created / written to the usb stick correctly?Īs for editing the maps, I'm interested in that too, to fix the wrong speed limits around my house. Instead I get an error about unsupported filesystem type but it works regardless. Interestingly I don't get a no audio files message, for me the media player has always refused to look at the ext2 partition despite the fact Linux has mounted it. If you have the firmware update you can check the same, but I'm sure it'll be the same firmware as I have where it does work for me. Do you have access to a copy of the D554 firmware for yours or D605? Before I installed D605 I unzipped it and checked all the relevent files and mount.sh to make sure the hack would still work. I'm not aware there are different firmwares for different real Connect 3s. I have seen references to a Connect 3 with no sd card slot (also referred to as Connect 4 in other places), but you have an SD slot so a proper Connect 3. Mine is hardware version 31 and has a different facia but I wouldn't expect that to matter. I have a Connect 3 in my Pulsar and it worked on that when running D554 and since I've updated to D605 it still works. There is also a custom file header before the PNG header which appears to contain encrypted/compressed data.Īpologies this is so rambly - just thought I'd share what I've observed so far and wondering if anyone has had any success in decoding any map data. In JUG00378.pnn, however, despite indicating the IHDR chunk is 13 bytes, only 10 bytes of data follows until the next chunk name is reached. ![]() Looking at the files in a hex editor quickly reveals they're using PNG format, however the chunk data appears to be partially compressed/encrypted.įor example, a typical PNG IHDR chunk contains the chunk length (13 bytes), chunk name ( IHDR), chunk data (width, height, etc.), and CRC. phn is "high " as these always appear to be larger than the. a different colour depending on the display mode of the navigation system. My first guess would be that the final "d" and "n" in the file extensions could stand for "day" and "night", i.e. For example, the file name "JUG00378" appears as: There appear to be four versions of each file. The files are contained within a folder called "3D_PICT". Specifically I'm interested in decoding what I assume are icon/graphics files used by the navigation system. ![]() Some plain text files exist such as XML, CFG, and TXT files. Most of the files are binary formats - some are known file types such as SQLite but most appear to be proprietary. ![]() The SD card contains a folder called "CRYPTNAV" which contains around 15,800 files, roughly 5.7GB in total. Mine came with a "V5" map data SD card, similar to the following: The firmware version is D554 (accessing the service menu is slightly different - I followed this video). Some context: I bought a 2018 Nissan Pulsar (Tekna trim) which comes with the following head unit: I was wondering if anyone has attempted to reverse engineer any of the map data that comes with certain models. Thanks for the writeup it's made for a very interesting read today.
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