Hey. i think i got it all running as it should now, i used one of the A6L 800x400 and it all seams to work as it should.That flickering, I don't think it's an issue. All you gotta go is, settings, factory settings, password 8888, audi, and there should be a screen settings, like q5 800x480 or something like that, just try different options. And you should be fine. Just gotta find your option in this case. If you won't be able to find it, I can look it up tmr and add some screenshots if u need.
Other than updates, MCU is a hardware based changes and optimization, and 3.08 is a software based update for the Android operating system itself, including the audi support. I didn't notice any changes, except for some audi pictures have been added, A6L and etc. Also b4 I had an issue with the android auto auto launching, it would not startup properly when I start the car, I had to turn off the Bluetooth and the wifi on my phone, and then turn everything on again, and after that it would connect. After update, looks like it's fixed and I don't have to do it again.
Also, what kind of boot animation do you have, when the android is starting?
Mine had Android, or the Warning message. After searching a little bit, I actually found an Audi bootscreen.
I got a nice Audi boot logo, and its animated when the Android is starting up, looks kinda cool. this is the logo. No more Android Logos..