This is my first post here, so please be gentle

I have just got my new AirFit Resmed F30 mask, I have been using the old one for more than 2 years.
The problem I have with this new one is I can not manage to separate the cushion from the frame (the base). No matter how hard I try (I was afraid I will even broke it) it will not get separated. Am I missing something, like in new models they are integrated together or what?
Appreciate any input.
Cheers!