I've just bought the 2021/2022 update cards for my 2014 A4, which has done the full software update. Came on 3 SD cards and took about 2hrs all in to update to the HN+_EU_AU3G_K0942_3 version. It cost me £50 and was easy to do at home myself. What version are you currently on? (press and hold 'Car' and 'Back' buttons at the same time for about 3 seconds to enter Engineer Mode to find out, then press them again to return to normal menu)