As the title says, I changed my password via the web gui on both APs (570 and 310) and the username too
I went from super to admin, typed the old password and the new one twice (one an then confirm)
Now I cannot log in at all - I have tried rebooting it but nothing happens.
What is the firmware on it? Is it stand alone?
I hope you have reconfigured the password correctly and using the same one to login into the AP.
I usually type the password on a notepad first and then copy paste it to avoid any typing errors.
If you are still not able to login, factory reset is the only option to regain the access.