To anyone who update the wrong firmware : contact TP-Link support and they will connect you to their technical department. They gave me a beta firmware version and my problem has been resolved.

@Kevin_Z thanks a lot. I already received the email from you guys and i will try to install the beta version to see if it works out for me. Thank you!

I have a TP Link Archer AX10(EU) ver 1.20 After accidentally update the One Mesh firmware : (US)_v1.2_210421, my wifi has became a real mess. Cannot connect to 5ghz band with smart connect on. Even...