well I have successfully changed the firmware for the version in the very handy post, which vRS Carl very kindly posted, however I am not sure if it has solved the battery drain issue or not....
I left the car for about an hour in the hope that it would go off but when I switched it on it seem to start up pretty quickly, does anyone know if the Welcome to VW message should appear if the unit powers down properly?
What Steve said...... BUT
You wont get the VW Screen if you leave the radio on,as the radio comes on instantly, i would suggest as a test
to leave the stereo on sat nav screen DONT TURN THE UNIT OFF,Turn the engine off ,Remove key from ignition so that the head unit
turns itself off,go away for 2+ hours,go back unlock the door and quickly put the key in the ignition and turn it so the dash lights up, and stereo turns on
The reason i say unlock and put the key in instantly is because as soon as you unlock the car and open the drivers door, the unit starts itself up ready to
switch on and hence you wont get the splash screen
hope it helps