Astrill Setup Manual:Getting started with ASUS Merlin firmware for routers - Astrill Wiki
All you need to know about Custom Router Firmware
Update now! ASUS fixes nine security flaws
GitHub - ttgapers/suricata-merlin: Custom add-on for supported Asus routers with Merlin firmware that introduces Suricata as an alternative to the Asus built-in Trend Micro AI Protection.