I setup my M4 and M9+ using this guide. https://www.blacktubi.com/guide/deco-m4-unifi-setup/

Did you guys follow this? https://www.tp-link.com/my/support/faq/2893/

@Muize Did you setup using andriod phone? Try use IOS as my Deco M4 and M9+ both unable to setup using andriod but IOS.

I guess I'm the 3rd cases face this issue. One of my fren faced the same problem and manage to get it done by the same way as well

Yes, the Deco is working fine now. Yup, I used ios apps to configure. Not sure why I'm not able to get it setup by using android

Ok, if the BTU you're refering to Modem, yes, it is already on port 2. On the Deco M4, i'm also connecting to port 2. But still unable to. However, i managed to get it done. It seems the Deco apps...