asuswrt-merlin
on SourceForge
GT-AC2900/Beta/GT-AC2900_386.14_beta1.zip
RT-AC86U/Beta/RT-AC86U_386.14_beta1.zip
RT-AC5300/Beta/RT-AC5300_386.14_beta1.zip
RT-AC3100/Beta/RT-AC3100_386.14_beta1.zip
RT-AC88U/Beta/RT-AC88U_386.14_beta1.zip
RT-AC68U/Beta/RT-AC68U_386.14_beta1.zip