My RT-AC5300 had been working fine until last night. I checked the router GUI and it reported a new F/W: v.3.0.0.4.384.81930. So I updated, the update seemed to have gone OK. The router rebooted, I power cycled after the reboot, and when the router came back up, it now reboots every few minutes. In its current state, it's now totally unusable. I tried hard resetting and reflashing the earlier F/W v.3.0.0.4.384.81902. Still the same rebooting issue. I've hard reset, no luck. The router is out...
RT-AC5300 Bad firmware flash
RT-AC5300 Bad firmware flash