While "Mxtronics" appears in hardware speed tests as a USB storage device vendor, there is no established official support website providing "verified" firmware for their SD cards. Most storage devices, including SD cards, are generally considered non-user-serviceable in terms of firmware.
USB Flash Drive Speed Tests - VID = aaaa, PID = 8816 - NirSoft mxtronics sd card firmware download verified
MXTronics SD Card Firmware Download Verified: A Comprehensive Guide While "Mxtronics" appears in hardware speed tests as
Copy the file to the root directory of the SD card, insert it into the powered-off device, and turn it on to initiate the auto-update. Victron Energy “MXT All-in-One Driver
By following this guide, you ensure that your MXTronics device receives not just an update, but a safe update. Now go ahead, download with confidence, and keep your systems running reliably.