I am not clear if you have tried a known good 5V 1A or better device as yet. If I recall USB2 power spec is 500ma and USB3 is 900ma so these may also be a problem, though I would hope not.
Some of the other unanswered questions.
You need to flash both parts, though I do not see anywhere it says they need to be the same firmware. They will have separate configs. I have not seem any info on how to choose the different flashes for booting (dual boot).
I read something about trying to boot 9 times before going to the alternate flash. At about 1 min per cycle this could mean that you are booting to the NOR as it can not boot the NAND (only a swag), but post 29585 indicates otherwise. What do you see in the app repo bar graph?
I agree, in general you should not need to SSH into the device once “operational”. There is no CLI console in GL.iNet or Luci gui, so to run commands Putty, WinScp or similar is needed.
I tried the “poweroff” command on my AR-150 and it seems to turn off the logic, but not the device. What happens with reboot and poweroff? This needs to be done from the CLI. There is an OpenWrt package called luci-app-command that will let you save commands to a list and run them from the Luci gui. Not what you want, but good to know.
The Saved Stations are in a file called \etc\config\ssids.
The “autoscan and reconnect” just enables and disables the function. It’s a toggle, not a button. If it’s off and you reboot, the device will not connect to a saved station, but the last station configured will get disabled if it can not be found. If the button is checked, it should try the configured station first, then cycle through the list looking for a station to connect to, which I think is the strongest signal, but not sure.
Re your comment in 29734 about the New Connection. If you have previously connected to the STAtion, then you should be able to connect to it from the Saved Stations button\popup under Settings=> Internet Status. Try Select to a know available Station. There is a bug (maybe, maybe not) in the GUI and the window does not close, so after about 45 seconds manually close it or refresh the window. For me I can reliably connect to the “Saved Station”, but I am on a different device (MIFI)
Finally at the bottom of the page is the service email: email@example.com