If you want, paste the VID:PID and product string now and I’ll hunt for specific firmware files and vetted flashing instructions.
However, here is a for safely downloading and installing firmware from an SD card for most embedded devices (e.g., 3D printers, CNC controllers, dashcams, or routers) — which is likely what you need. mxtronics sd card firmware download
Most MXTronics firmware expects the update file to be placed in the of the SD card—not inside any folder. For example: If you want, paste the VID:PID and product