@David-TP
**Update: Yes, it is provided by PLDT, and I already fixed it.**
This is how I did it:
First, download the latest version of firmware depending on the version of Deco M4 you have (Note: V3 Firmware will not work on V2, and vice versa).
You can find the Deco M4 version on the bottom sticker.
Connect a cable from your Deco to your Laptop/PC and change the IP Address to static 192.168.0.2.
Next, long-press the reset button while plugging the power plug into the Deco. The Deco will light up yellow. While still pressing the reset button, wait for the light to turn off.
At this point, go to your browser and type 192.168.0.1, then upload the latest firmware that you downloaded from the Deco firmware page.
After successfully uploading the latest firmware, unplug the power from the Deco and plug it back in.
Now, you can check from your browser by going to 192.168.68.1 or 192.168.68.1:30000, and the Web UI will be accessible.