An update to my Wi-Fi network issue. I purchased phone on eBay international version from a seller in Texas. It's the ZS673KS Cn version (Mainland China). I reached out to the US Asus support online, they mention I have to contact CN support . I reached out to CN (Mainland China ) through email hoping I can ship the phone for them to repair or replace or whatever, they can't help me because I live outside of China. So I'm basically stuck with an expensive useless gaming phone with no help from the Asus committee.
I have no idea what to do and I losing my trust and respect for Asus company.