I don't think the lock is undone, by holding down the boot release button, as after the unlatching sound the boot is still shut and you have to still undo the catch from outside, as I tried lifting the tailgate using the edge of it, and it would not open till I used the outside button on the tailgate. so fitting struts would still not work. The hand book says hold down the boot release button for more than one second to unlock the boot, but leaving the rest of the car locked, it does not tell you to just press it.