Hi! I have an RT-AC66R, it's currently running the latest merlin firmware I can find, which appears to be 374.43_39E3j9527. I tried installing the script, but I get the following result:
admin@RT-AC66R-8C88:/jffs/scripts# ./YazFi install
YazFi: Welcome to YazFi v3.2.2, a script by JackYaz...