asuswrt-merlin
on SourceForge
RT-AC5300/Release/RT-AC5300_380.57_0.zip
RT-AC3100/Release/RT-AC3100_380.57_0.zip
RT-AC88U/Release/RT-AC88U_380.57_0.zip
RT-AC66U/Release/RT-AC66U_380.57_0.zip
RT-AC3200/Release/RT-AC3200_380.57_0.zip
RT-AC87U/Release/RT-AC87U_380.57_0.zip
RT-N66U/Release/RT-N66U_380.57_0.zip
RT-AC56U/Release/RT-AC56U_380.57_0.zip