Previously i was using Maxis 30mb fiber via their Maxis TG389ac router at place i used to rent in another state.
I decided to cancel as i moved back to my own house which im using unifi. The existing unifi router is old and i thought of reusing the maxis router instead to save some money.

Anyone can suggest how i can configure the settings? Been trying but i cant seem to get it right.

Appreciate some help.

U try check maxis router got any vlan tagging or not? if not then cannot use at all.

Give up, maxis custom firmware heavily locked, get another router instead

How do i check?

U know the default gateway?

If yes login using web browser, from there u can check it.

But as imalmighty mentioned, maxis might heavily locked the router and you might not able to do any setting.