1) MaxisysPro 908P can't do this............

2) A5 2009 is one with Component Protected System...........

3) You will need a Dealer Pre-programmed key...............

4) And than need the Pin Code.............

Your best way to go is find somebody with AVDI with full Vag Software and you will be happy

Hi, you may try as below steps:
Please go to Audi->System selection ->Service->Read password to get the immobilizer code. Then go to Audi->System selection ->Diagnosis->Control unit ->17 –Dashboard or Immobilizer and select security login. The login password is the immobilizer code. After login Adaption go to Channel 21 and the channel value is the number of keys matching. Please enter the key number that you want to save then insert the keys one by one. Kindly be noted that if Maxisys cannot support to read immobilizer code of this car you may get it from 4s shop.

For tranny code, please go to System 56 and select coding function. If you don’t know the code, please inform us the VIN code of this car and we will help to get correct code for you. Thanks!

 Support:  Can you please explain what is (4s shop)...............?

In China, authorized car dealership are called 4S car shops.

 Dear Support I think your instructions don't work in this type of car because they have IMMO 5. This instructions are only available until IMMO 4.

 Not only that.....................It also has a Component Protection System................!!

Yes, you are right. It can only work till IMMO 4.

 In theory, we can use Maxiflash Pro, connected to ODIS, payed a hour of subscription and you can that service. 

But first you have to register in Audi website, install ODIS and order the TOKEN pen.