I just received my XPS 10 with LTE(AT&T) support today, and I have a problem, the LTE modem doesn't seem to work.  When I go to the Device Manager I notice that the modem(EM7700) has a yellow exclamation point next to it.  Going through the driver update procedure doesn't help, it errors out that there is no driver available for it online. 

Besides sending it in for repair are there any other options for me to try to fix this?

My only option besides a refund, is to repair it, since I purchased it from the Dell outlet store, and there are not any more available with LTE.

Thanks in advance for any help!