SOLD
I bought these off ebay and successfully updated the firmware & maps in my 2013 A5 and now have no use for them, so I thought I'd sell them off a little cheaper than what they'd cost you on ebay.
My firmware was what came in the car originally: HN+_US_AU3G_P0566
If yours is the same, then this should work fine for you. I'll include also a Samsung SD card adapter - the ones that it came with threw an error and the sellor did mention getting a bad batch, but I'll not pass along that part.
From ebay, you'll pay $45 for the firmware and $80 for the maps - total of $125. I'm asking $85 for all of it AND a known-good, working adapter, AND the instructions I got, AND shipping to the continental U.S.. It's not a difficult process, but you will need to have the hidden menus enabled, and then have VAGCOM handy to re-enable after the FW update since that update will again disable that option.
Hit me up with any questions.
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