Going to switch to FreshTomato from Toastman. For Toastman use "RT-AC," version, not sure if should do same for FreshTomato/ Shibby line of builds...
freshtomato-RT-N66U_RT-AC6x-2019.3-AIO-64K
or
freshtomato-RT-AC66U_RT-AC6x-2019.3-AIO-64K
freshtomato-RT-N66U_RT-AC6x-2019.3-AIO-64K
or
freshtomato-RT-AC66U_RT-AC6x-2019.3-AIO-64K