Sorry I don't have an answer for you but would you be able to share what you do have? I had my unit replaced and its on 59.xxxHey,
The Mazda 3 infotainment firmware updates used to be stored at my.hidrive.com/share/hsodpqja.l# however it looks like that user was deleted or their online storage drive was deleted. I managed to download 74.00.230A for NA infotainment version 1 cars but I also want to keep up to date. Does anyone know if it's posted anywhere else?