I am using the ASUS router RT-AC59U. I dont see a firmware available for this. The closest match I found is RT-AC58U. Looks like they have different hardware and hence I hope a cross flash will brick the router. Is there any other firmware that I can use on RT-AC59U ?
RT-AC59u, RT-AC58u v2, RT-AC57u v2 all use relatively new and unknown single core Qualcomm QCN5502 SoC. I believe there is no OpenWrt support at this time.