I have a 2 week old CX-5 GT with no Mazda NAV. After reading many threads and comments about this, it seemed the most recommended NAV SD card through Amazon. $64 through Saksonov's Shop, Michael Saksonov supplier. After reading dozens of positive review about this card on Amazon's comments, I purchased the card TD2K66EZ1 for 2021 Mazda CX5 CX9. SD card arrived while I was on a short vacation. I returned to the original sales site on Amazon, to get some installation tips etc. Site now says Page Cannot Be Found. I was initially concerned about a DIY installation but the dealer's $400 card and install price seems very excessive. However, I now have a $64 card I am reluctant to trust. Do NAV SD cards ever brick an Infotainment system? Does anyone recommend just going through the dealer? Concerned and more that a little frustrated, at this point. Any helpful comments greatly appreciated.