Zyxel Firmware Emg3525-t50b ((free)) (PLUS)

Don’t trust the mobile app. Do this:

Navigate to http://192.168.1.1/cgi-bin/telnet_enable.cgi (Change IP to your gateway). This enables diagnostic commands like ps (process list) and wl txpwr (adjust radio power). Zyxel Firmware Emg3525-t50b

: Up to 300 Mbps on 2.4 GHz and 867 Mbps on 5 GHz. Don’t trust the mobile app

: A widely deployed stable release from late 2024/early 2025. Zyxel Firmware Emg3525-t50b

This is the trickiest part. Zyxel does not always host ISP-specific firmware on its main public portal.