There is unlikely to be any further firmware update for 3G from Audi so if you've updated to 0257_5 or 0257_6 you won't need to do it again.
If you don't have/can't get access to VCDS and need to activate the green menu you can use the following script from Congo's 3G+ thread [ Green menu activation ]
1. Unzip and copy to SD card.
2. Put the SD card in the MMI.
3. When prompted press the center knob.
4. After the script is done you will see confirmation screen.
5. Remove the SD card and reboot MMI
I haven't used it, but it appears plenty have
2017 maps version 6.24.2 and FSC activator - PLEASE NOTE - this package is ONLY suitable for 3G and not 3G+/3GP so if your firmware version doesn't match the style indicated in the instructions do not bother downloading this file, as it's been cut down to make the download smaller and so it'll fit on a 32GB SD card without issues.
PLEASE NOTE - THESE ARE FOR EUROPE, NOT ROW OR NA and I cannot help with questions about where to find them.
I recommend using JDownloader to grab the links and WinRAR for extracting the archives when finished downloading. If you hit the download limit from Mega and don't want to pay for premium downloads I can recommend using the Opera browser, which has a built in VPN tool so all you need to do is switch location and it will allow you to continue downloading. You do lose the option to use JDownloader if you go that route.
These files are from a variety of sources, so credit due to all those who compile and make available :grin2: