When you've checked in and left your baggage in Bag drop, you have to through security. See the rules pertaining to the security checkpoint below.
Our new security control in Terminal 5 has opened. It has inherited the name 5F from one of the previous controls. The other security controls in Terminal 5 are closed and be opened only if the need should arise. The technology in the new security control differs from the other security controls at the airport, so be aware of which control you're going through and follow the instructions you get in connection to said security control.