My two GL-AR750S-EXT used to work. After trying to update the firmware, I cannot get either one to function.
I successfully updated both to 3.211 and then 3.212. Immediately after updating, I was able to use the web interface, connect a switch and two devices downstream of the switch, and tether my iPad. As soon as I cycled power on the router, I cannot access the web interface anymore.
With nothing plugged in, the router appears to boot and both the 2G and 5G lights eventually turn on.
As soon as an ethernet cable is plugged into the router, the 2G and 5G lights immediately shut off and it appears to reboot. Leaving the cable in, it reboots every 84 seconds (presumably it gets to whatever stage in the boot process and just hangs there). I can’t ping it, because it fails to assign an IP address to anything that gets plugged in (or it’s rebooting as soon as it tries for some ungodly reason). For the same reason, I can’t ssh into it, either (no IP address assigned). Manually assigning the IP address to the 192.168.8 subnet does no good, either.
Likewise, if I try to connect to it via wi-fi, instead of ethernet, it exhibits similar behavior. Before I can enter the passkey, it reboots.
On the other router (also successfully updated to 3.212), I had the exact same issues. I tried reflashing via the de-bricking procedure to 3.104, which was successful, but then the same thing happened. After I cycled power, the same bizarre rebooting behavior was occurring. Now I’m stuck. As soon as a I plug in a cable or attempt to connect via wi-fi, it reboots. Because I can’t get into the web interface, I can’t get past 3.104.
I really need to have a working travel solution for this upcoming Saturday, but it isn’t looking good. I’ve wasted at least two days trying every permutation I can think of to get either one of these working, but it’s just looking more grim with every iteration.