Mazda CX-9 2019 Owner's Manual page 7

When inserting the SD card, never move the slider on the side of the SD card
to the LOCK position. If the slider is set to LOCK, the SD card cannot be read
and the navigation system will not operate.
This SD card is valid for use in only one vehicle. Never use it in another
vehicle. If the SD card is used first in one vehicle and then in another, the
navigation system for either one of the vehicles may become inoperable.
SD card/map updates
Map and data stored on the SD card can only be modified using the special
Mazda Toolbox application. All details concerning the Mazda Toolbox
application and the method for updating the maps can be found on your
local Mazda website. We strongly recommend that you make a backup copy
of the SD card data using the Mazda Toolbox application before starting
the map updating process. If a problem occurs while updating the SD card
update, it could result in the loss of all the content on the card (such as map
data, software, additional services).
The only way to restore lost data is to use the Mazda Toolbox application and
the copy of the SD card made beforehand.
Insert and remove the SD card with the ignition switched off.
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