When you try to access your PLDT Home Fibr Router admin page from going to your browser and typing to the address bar the default router I.P address which is 192.168.1.1, and there is an error which show that you can't access the page.
1. Turn off your router
2. Unplug / Disconnect fiber cable from the router
3. TURN IT BACK ON ( without the fiber cable attached ) and access the router GUI by going to your browser and type to the address bar the default I.P address of your router which is 192.168.1.1 then log in.
4. Apply all settings you want to do then when you're finished.
5. Turn off your router
6. Reconnect the fiber cable to the router.
7. Turn on the Router
If you have any question please leave it to the comment section below.