5.01 software is what we have available for download. Tech support has 5.04 to be given out when needed to address a Simrad XTE issue. I have never heard of 5.2 for TZT. What country did you buy the unit?
That is the version of your inserted Map (SD) card.
For TZT, go to - HOME BUTTON - MENU - INITIAL SETUP - SENSOR LIST. You will see the full version of the software next to the TZT model number in the appropriate version column.