I have a 2012 Mazda 3 Maxx Sport BL Series 2 and I'm wanting to know how to update the sd card to the latest version, version 20. I cannot read the sd card, and have a SDHC reader but still can't read it. I spoke to Mazda and they said only the latest model has the ability to update online and even though my car is under 3 years old, they don't cover the cost of a map update, only if it is the current shape. So can it be done?