Xenforo update xenforo 2.0.9 to 2.1

Is there any steps on centminmod to update to xf2.1
like for the header?
do we have to comment

Code:

add_header X-Content-Type-Options "nosniff" always;

something to do for the push notification?

thank you

---

 

Thank you @eva2000 and @rdan

everything workes fine except reaction system
on like button mouse over nothing appear (it workes on xf website)
i can only use the like reaction
any idea

 

i have found the solution