The Critical Role of Firmware in MXtronics SD Card Performance and Recovery
MXtronics doesn't typically provide a consumer-facing "update" button. Instead, you need Mass Production Tools (MPTools) Recovery Tools Specialized Repositories: Sites like FlashBoot.ru mxtronics sd card firmware download
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. The Critical Role of Firmware in MXtronics SD
Settings > About or System > Firmware Version.