Unboxing the Aerobook / defaultuser0 / password

I just unboxing the Aerobook. The first surprise was that started at Bios. Then it appears as username “defaultuser0”. So, why there was already a user on place? I am not happy at all with that. Then, what it is the password? Anyone can help? Before returning it. Many thanks

You can consult the Chuwi store customer service of purchasing websites.