ZTE modem compatibility with TP-Link TL-MR3020 router
Answer
Hello. I wrote in detail about selection and compatibility of routers with USB modems in this article: /3g-4g-internet-setup/how-to-distribute-the-internet-via-wi-fi-c-3g-usb-modem-routers-with-usb-modems-support/.
There’s also TP-Link information there as well. On the official site (link to the page is in the article) you can download a file with a list of compatible 3G/4G modems. For your TP-LINK TL-MR3020 router model, I didn’t find ZTE WCDMA Technologies MSM in the list of compatible ones. Really, it seems to me that your modem has another model.
In the list of compatible ones there are only: ZTE MF 100, ZTE AC 5710, and ZTE AC 5730.
It happens that the modem is not in the list of compatible modems, but the router detects it and works without problems.
I advise you to download the file with the list of compatible modems and check everything yourself.