Run network-wide ad-blockers like AdGuard Home or Pi-hole directly on the device.
Installing custom firmware on the ZTE F660 requires careful planning and execution. Here is a step-by-step guide to help you through the process: zte f660 custom firmware
These are official firmware binaries that have been unpacked, hex-edited, and repacked to: Run network-wide ad-blockers like AdGuard Home or Pi-hole