Furuno has released a minor software update to TZT3 and TZT2BB units. Some users might have noticed when connected to Wifi that it offers to upgrade for you. Customers with v3 or higher with TZT3 can upgrade by Wifi and TZT2BB customers with v9 or higher can upgrade by wifi to this newer version. Anyone wishing to upgrade with older software, or have no wifi, would need to use the USB update process posted under the product support page of the respective product. Software history document also posted under the product page shows the changes made.