@Kevin_Z i was able to log in through tether app firmware 1.3.6 20200902 rel 65591, hardware 2.0 just upgraded. Now login works fine.

How to check firmware when I have no access at all?

Have you solved it somehow? I just updated firmware (I think to the latest available) and now the ap is broken. Can't login at all (the login page is not openning, if so when I press "login" it never...