Found this in the archives.
"Installation couldn't have been easier (2017 Toyota Avalon). Turned off car, removed original micro SD card (I needed a small screwdriver to pry open the map data cover, it opens like a book with the hinged side on the left). Removed old card, inserted new card, and restarted car. The screen recognized that new softward was available and instructed me to turn the car off and then back on to start installation. The software loaded in less than 10 minutes with a progress bar to let you know the progress. Once installed everything worked normally."
The manual is very vague on it. It portrays it as being explanatory.
Just don't force it, I'm sure an owner will speak up.
