Hello,
We recently got new ISP (O2SK) and they gave us hap ac2 but when I login into web interface there is almost no options, only change password, rename wifi… (cant event change language). I tried upnp port fowarding utilities but with no success. It is running “RouterOS v6.49.1 (stable)”

WebFig has feature called “skins” that allows to hide selected parts of UI. It looks like ISP doesn’t want you to mess up their configuration. Try to connect using WinBox, it should be better. There’s support for skins in WinBox too, but only in new versions, so hopefully it won’t be there. If you don’t succeed, you’ll have to talk to ISP and request full access. Other way would be resetting the router and getting rid of this, but it’s probably not the best idea if you don’t know whole required config.