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Aug 12, 2019 Asuswrt is the name of the firmware developed by Asus for use on all their recent routers. It was originally based on Tomato, and got extensively modified by Asus over the years as they added their own features to it. Asuswrt-Merlin is an alternative, customized version of that firmware. Developed by Eric Sauvageau, its primary goals are to enhance the existing firmware without bringing any. The ASUS RT-AC66U Gigabit wireless dual-band router offers 5G WiFi with a max bandwidth of 1.75Gbps across 2.4GHz/5GHz. ASUS PCE-AC66.