Yes, Tplink added the Huawei E392, E3276, E398 modems to the compatible list of MR3020 http://www.tp-link.com/en/support/3g-comp-list/?model=TL-MR3020&location=1144

Yeah, useful guide. It solved my friend's problem. The Tplink still don't update the firmware version to support ZTE MF825A. You could view this steps to make it work. If you want to buy another 4G...

Hi could you please tell us which sub version of your E3272 modem is. As far as I know, the Huawei E3272s-153 modem is compatible with TL_MR3420 V2 and TL_ML3220 router. Have a check with the lists...

After checking with the compatible list of TL-MR3220 at http://www.tp-link.com/en/support/3g-comp-list/?model=tl-mr3420&location=1154, it only support usb modems, such as Aircard 320u, Huawei E392...

Though E3276s-151 has the same LTE frequenices with Huawei E3276s-150, it cannot be comaptible with TL-MR3420. Other similar modems are Huawei E3272s-153 and E3327s-153. Take a look at this list:...

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.