GNU/Linux MX Installing MediaTek MT7921 Driver Guide
Hi! This tutorial will guide you step-by-step on How to Install Ralink/MediaTek Filogic 320 MT7921 WiFi/Bluetooth Wireless Driver in MX GNU/Linux Desktop.
And to make use of the Latest MediaTek MT76 Driver on MX it’s enough to dispose of an Updated Linux Kernel.
After a Kernel Upgrade, it is Strongly Recommended to Immediately Proceed with a Firmware Update to Ensure Hardware Compatibility and Optimal Performance. Follow this Guide: How to Update Linux Firmware on GNU/Linux Distros.
Especially relevant: this Driver is supplied from Linux 4.19 but some important Connection Issues has been fixed only starting from the 5.4.1 Kernel release.

How to Update MediaTek MT7921 Driver in MX