Invalid activation key. The key you entered may have been activated already or may have been entered incorrectly. Please verify that you are entering the correct key.
There are many ways to key in your password(code) for Invalide Activation Key corrections;eg:-
(1)For activated already key;try clear release button- main#;
---If entered incorrectly,may try for C.T.=meaning Care taker.
(2)As owner I clear release the main#, then the correct code and" please enter;"
(3)As for visitor,call for owner by trying Floor/Unit buttons.He will activate button (#) to let you in.