@woozle What seems to be the issue is that the lastest firmware listed at the download page (https://www.tp-link.com/us/support/download/tl-wa850re/#Firmware) is said to have been published on...

Sorry I don't know why the third picture didn't went through, here it is. Also I should mention I did try the beta version first and then the final firmware, none of which gave me the option to...

@Joseph-TP I have the TL-WA850RE V7 and just upgraded the firmware, however both in the Web UI and in the Android app I see no option to change the extender's password. I did a factory reset but...