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Search this and other Mazda forums you'll find many other cases, they won't admit they screwed up. Forget dealer contact Mazda North America direct that's what the dealer expect you to do get an authorization from corporate to OK CMU replacement. Claim loyalty to the brand and they'll fix it for you. Good luck.

BTW dealer techs don't sit in the car for an hour during update, they connect a battery maintainer put transmission in Neutral (timeout disable) place a sign in car "Software Update In Progress" and they leave vehicle unattended. It's all in a bulletin.
 
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