@syeeng84 I figure out how what's wrong already, Seem like for m1 user you will have to first "disconnect"'the WAN connection from your old router. Then plug in the new TP deco will assign a new IP...

I'm now trying to setup my new purchased main Deco M4 to a huawei HG8240 modem following the guideline in the app, but i always stuck at connecting the internet with red LED. I tried use different...