I have RT-AC86U and Merlin 386.7_2. I'm unable to set the wireless channel bandwidth and control channel for 2.4 GHz and 5GHz frequencies. After I configure them and hit apply it just goes back to the default of 20/40 MHz, Auto control channel for 2.4 Ghz, 20/40/80 MHz, Auto control channel, Auto extension control for 5 GHz. I thought I used to be able to change these settings but now I can't remember.