How do you disengage the ABS on this car ? on 2005 Audi A6 Quattro

When driving on snow, the ABS kicks in and the car won't stop. When driving on lose snow, I rather have the ABS turned off. I used to have this option on previous Audis. On this 2005 A6, according to the manual, disabling the ESP and ASR should disable the ABS also. I have tried that many times unsuccessfully. The ABS is always on. Has anyone been successful at disabling the ABS on these cars ?

Asked by for the 2005 Audi A6 Quattro