Are there things i can do to try to make it work? For example, plugging in a patch cable into my PC and doing any diagnostics or a hardware reset, or a manual firmware upgrade, maybe even reflashing...

@TP-Link WOW Same thing happen to me :( I update via tether on app, i saw there was update. It hit 100 percent on the app and complete. And then i was waiting and waiting nothing happening. So i went...