How about contacting the sim card provider for help?

Great news! ;)

Make sure you can see the adapter in device manager, and install the driver below manually . http://support.tp-link.com/f/daebb3acb6/?dl=1 http://www.tp-link.es/faq-920.html

Try add web as higher priority? TV's priority is too low. It will affect the bandwidth of it.

not working when directly upgrading to the previous one? http://www.tp-link.it/download/Archer-VR2800.html#Firmware

Do you still see the 5G wireless name? Does this problem happen on all your devices? Make sure the wireless light is on and change the channel of 5G to 36 or 144. By the way, do you see any error...