this thread helps http://forum.tp-link.com/showthread.php?74301-Tplink-MR3020-4G-Huawei-E3276-Problem-Resloved.&region=china It resolved the combine of tp-link with E3276 modem.

Hi, there are a lot of users use Huawei E3276, Huawei E392 and more for there TP-link router. If you have problem you could ask the forum for help like this...

Thanks nik23! I updated the firmware for my Huawei E3276s-152 modem, and now it works with my tp-link router now. I nik263 wrote Hello. I flashed my 4G huawei e3276 with the firmware version...

Yes, it also works for my unlocked huawei e392 modem! Thanks! ruildias wrote Hello Telmo, I had the same problem with the 3420 and I solved it setting the APN and dial number manually: dial number:...