VAG-COM-FAQ-3.8
From Ross-Tech Wiki
3.8 What's the De-Activate button for? Why would I want to do that?
All of our Current Interfaces have Activation built-in, so there is neither a need or a choice to De-Activate.
If you have a "dumb" interface that does not have built-in Activation see this page: 5.2 What's the De-Activate button for? Why would I want to do that??