FAP-221B Cannot access http

Hi All, I have one APs FAP-221B without controller it looks there is very old version, but I do not know how to find out which one. 1. I want to use this AP as standalone, and I read, that I should use AP type FortiCloud (when I do not have wireless controller), but I have only 6 options and FortiCloud option is not there. 2. I have access only via telnet, if I want to connect via http i can see login screen but immediately after I'm logged in I'm also logged out, I do not why, password is correct only admin. Maybe it will help to upgrade AP, but I did not found any command. I do not have any wireless controller or fortigw... Could you please help me ? Thanks a lot.