In this video I explain how to fix a rebooting Mazda infotainment system (CMU) by replacing it with a new used one. New CMUs out of other Mazda models can be used. The used units can be bought off eBay between $60-$150 dollars. Total replacement time takes about an hour or less.
Special thanks to https://www.no-copyright-music.com/ for the music in the video.
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What firmware did you get in a new cmu?