Aston Martin DB11 Owner's Handbook Manual page 197

To Raise the Roof
3. Remove the roof emergency tool (B) and put to one side.
This will be needed to lock the roof.
Once the manual roof raise procedure is complete, you will
not be able to operate the convertible roof until it has been reset
by an Aston Martin Dealer.
1. Remove the wind deflector (if installed).
2. Remove the head rests (A) for the rear seats.
11.9
Convertible Roof