1. its hard to expect that from them coz they never hear customer and will just avoid you
2. mine f660 just blocks
mac clone of
router as it doesnt provide connectivity with mac clone and do need kind of jugaad to get it working without mac clone so probably its hard and sometimes get disconnected,even when ip changes,you need to change that manually.
3. your
ont firmware will be updated from backend when it gets connected,it will not change the password but next time when you reset the router,admin interface wont open as it happened to me,ont updated and after some time i needed to reset it but after reset my previous password stopped working.
-so all this mess will just waste your time and is not worth it much,so in my opinion if you want to use your own router,you need to use DMZ+all port forwarded to ur router with wifi and dhcp disabled on ont and manually connected via local ip.
using DMZ will resolve double nat issue for games and other applications
and yeah they dont have proper authentication,u can literally see everyone's router mac address in router mac table and use their mac address to get internet access from their account and plan,most insecure.