Elias sat back and watched. The ZTE F689 sat on the shelf, silent and submissive. It wasn't making decisions anymore. It wasn't assigning IP addresses. It wasn't throttling his speed.
Most fiber ISPs (like PLDT, Globe, or local municipal providers) can push a configuration update to your modem remotely to enable Bridge Mode. Zte F689 Bridge Mode
Altering modem settings may violate your ISP’s terms of service. If you cannot revert the changes, you may need to call your ISP to reset the configuration. Proceed at your own risk. How to Configure ZTE F689 Bridge Mode (Step-by-Step
If true Bridge Mode isn't available, use IP Passthrough (DMZ). This isn't perfect (it still involves Double NAT), but it works for most users. It wasn't assigning IP addresses