Ten year old WRT54GL cannot stay on for more than a few hours without restarting so unfortunately need to replace. Understand that the RT-AC66U_B1 is an ARM device (https://www.snbforums.com/threads/can-asus-rt-ac66u-b1-run-asuswrt-merlin.35323/page-2#post-293351) among others. Is tomato-RT-AC68U-9008.8Toastman-ARM-VPN-64K.trx the correct firmware for the RT-AC66U_B1? Secondly has anyone been using a RT-AC66U_B1 with Toastman or Shibby Tomato so far? For learning purposes what is the likely issue/ hardware failure that causes the WRT54GL to restart constantly? After replacing will probably reset NVRAM and use as a switch while seeing if issue is still occurring. Thanks and have a good weekend.