How to Perform the Infotainment System Update Procedure
WARNING: Perform the following procedure at your own risk, it may not be possible to undo the changes caused by updating your system!
Note: Performing an update requires that you have the correct update files, if you do not trust the integrity of the files you are attempting to perform an update with then please do not attempt an update.
What you need:
cmu140_NA_XX.XX.XXXA_failsafe.up - (File name similar to this)
cmu140_NA_XX.XX.XXXA_reinstall.up - (File name similar to this)
2014 Mazda3 with Infotainment System
The following instructions are directly from the service bulletin on how to update the infotainment system: