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Can it be more than 8 characters ?
The chipset limits the input no more than 8 characters.
Sure. You can change the wifi password within the app. See option on top.
What phone do you have? and have you download the last version of App?
Here we tested it again, it works as it should.
Click the passwords, and input new, you can try on very simple one, like 87654321, and click OK, it should work.
WiFi will be disconnected after change, you need to reconnect WiFi and input new Password again.
To change back to the default password, just reinstall the firmware, can download from website.
Solved it, the new password must be at least 8 characters.
@nmgorsia I'll add that nugget of information to the top tips !