Copied this from BlackworksInc post of 2015, plan to continue to use Google maps as a supplement. Toyota lost their mind with this one:
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Starting with the 2012 model year, all the headunits from then are updated via the USB drive.
The file should be "01032-HBEKR-15A.zip" (before it's unpacked), that will update the Entune to 5.1.0
Unfortunately, it does not update the map and GraceNote databases; this is strictly for the Entune OS. As far as I know if you want to update the Map & GraceNote Databases you have to purchase an ACN (Activation Card Number) from the dealer parts department:
Then the technician will use a SST USB Drive to get a request code from the Headunit, then inputs the Request Code, the ACN and additional information into TIS for a valid software license key, which then gets inputted into the headunit and allows it to update the map databases via the SST USB. It takes something like 35mins just for the update to installation once you validate it.
I don't think they started using the MicroSD cards until about 2014 on a lot of our models. But it does seem to be plug & play.
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I threw my DVD in the fireplace and watched it melt away after the seller did not respond to my request for a return.