Go to the main menu system (two presses of the MENU button from most Views) and look under the Views menu tab for the Self Test View and set it to “Visible”. Then exit out of the menus and scroll through the available Views until you come to the Self Test View and it will show the software version in about the middle of the screen.

Installing a software version older than what the unit was built with could possibly render your unit inoperable, requiring it to be sent back to Humminbird to be reprogrammed. Never load an older version of software than what the unit was originally built with.