I have a 2016 Mazda6 with firmware level 51.00.300. I have looked at GENUINE Mazda CarPlay+AndroidAuto+WCP INSTALL... . In the NA N Current Firmware folder is a folder named NA N 74.00.230A Latest. In that folder is an .up to take the version to NA N 74.00.230A. However there are no intermediate updates yet the FIRMWARE ALERT-MUST READ.txt file says I must go to level 70.00.100A then 70.00.367A and no mention of 74.00.230A. Is this old doc? Can I just go from 51.00.300 to NA N 74.00.230A? Thank you.