Hi,
I have what I believe is the same unit as the UAD unit, but instead directly supplied by the manufacturer. Mine is a Joyeauto WJAU-1, which is the touchscreen version for my no MMI Audi A5 cabriolet. I thought it worth providing an update on my unit.
I initially had two issues with my unit, which I have since managed to get resolved.
1) The first was a row of differently lit pixels across my screen when using the unit. It turned out that a replacement screen I sourced from aliexpress sorted that for the princely sum of £17 delivered. My original screen was an 8T0 919 603F, with the replacement an 8T0 919 603G. I had removed the antiglare film on my original screen, using Plast-X, and it may have been that which caused the problem with the screen, but the brand new screen has an unmarked anti-glare filter in place and so my screen now looks great.
2) The second was an odd issue when holding my finger on the screen for longer than 1 second. The unit would switch off. I first noticed this when I was adjusting the contrast and brightness. After speaking with the supplier, they confirmed that this was a facility to switch the unit on and off when your car is not fitted with steering wheel controls. I wasn't initially convinced, as have not seen any B8 cars without steering wheel controls, but I guess they may exist in other markets around the world, This does still cause a very minor issue with moving your finger around on maps, but with a little practice can be worked around with shorter touches of the screen.
Minor issues I have encountered:-
1) Handshaking when you get out of the car and back in after a short period (2-3 mins) to grab an ice cream, whilst leaving the missus in the car. Getting back in the car, and the unit seems to have lost connection. To get round this I have begun taking my key out of the car each time. I have also found that on the odd occasion that you need to unlock your phone when getting back into the car after a short duration, to allow it to connect. Relatively minor issue in my opinion.
2) Another minor issue is with RadioPlayer app. It does not always display the correct information on screen, but it is running, and so pressing on the appropriate section on screen works fine. I haven't looked to see what other apps are available yet. I have experienced quite a few audio drop outs using this app, but I guess that is par for the course with what reception your phone is receiving.
3) The unit has lost screen connection (but not audio) on one occasion. I had to go into the unit's menu system and select reboot phone, which solved it.
4) Darker screen. On occasion, the screen has not recognised that the backlight should have come on. I've seen this occur maybe twice in 6 weeks. It does appear to be based on your iPhone settings for day/night, but I wonder if it may be related to my phone being in my pocket and the ambient light sensor? It's no biggie for me.
Why it's great...
I have most of my favourite music stored on my iphone (40Gb worth) in ALAC (Uncompressed format) and the music app interface is great for navigating around this. The ability to show album artwork makes the screen look so much better than the standard audi interface, which is now looking very long in the tooth.
It brings the interior right up to date. Instead of the tired audi interface, you have touchscreen apple car play. What's not to like?
The ability to play podcasts is great for longer journeys, not that there's anywhere we can go at the moment.
The Waze app is awesome. The ability to have other road users update the map on your screen about local traffic events is superb in my opinion.
Touchscreen. Being able to move around the maps with the touchscreen is a great feature, but again only available with the models that support touchscreen. It was actually a bonus that I didn't have MMI installed in my car, so that touchscreen is supported.
DAB. Effectively gaining Digital radio in your car in with the unit.
Hey Siri! I have the microphone mounted in the correct location, and have no issues with the phone hearing my commands. For example, Hey Siri, call blah blah, works first time, every time. On calls I have made, the receipients confirm the call voice quality is excellent.
Messages/Whatsapp. Having Siri read out your messages on arrival and being able to record a reply is great and allows you to concentrate on the road.
Future plans...
I've bought a cheap reversing camera for £8 from aliexpress, and intend to install that once the weather warms up a bit. I'll take pics and advise on how that install goes. My car is a cabriolet, so the standard camera's for the A5 coupe and Sportback don't fit (they are a little larger), so I plan to modify the boot handle. Maybe too much A-Team when I was a kid.
Lastly, I'm not French or Spanish, but actually English. The forum is picking up the country from my current VPN connection. ;-)
Hopefully helpful.
Cheers, Lee