If you don’t have VCDS or you have Carista and you’ve updated your firmware beyond 0770, you lose the ability to easily enable the hidden / green menu. To fix this, run the script provided below:
Download the script from here
Get a SD card smaller than 32GB and format it FAT32. In the room of the SD card folder you should see the folder structure:
Insert the SD card into slot 1 on the MMI and shortly you should see the below:
Press the MMI knob and wait a couple of minutes. You should then see the following:
Restart the MMI. The green / hidden menu will now be accessible.