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 Deco units also tried with different IOS devices.

Dynamic internal connection was selected during setup, and the Deco always switch to red after creating WiFi network, and prompt internet connection error. The IP address, mask and gateway detail in IPv4 are blank.
 

Verified my modem is ok using laptop lab, switching back to ASUS router works perfectly. I also did try clone MAC address from Ethernet but no luck. I'm using Singapore M1 fiber optic. Anybody can help me?