I have an RT-AC68U with firmware 376.49_4 and tried to upgrade the firmware with newer versions such as 384.19_0 it however I have been unable to get it to work. When I upgrade it says its working and goes from 0 to 100 then says complete however it doesn't do anything and just stays on the current firmware. I don't see any notes about it in the system log. I also tried the latest official firmware as well but did the same thing. Does anyone know what could be the issue and how I could troubleshoot it? Thank you.