If you are looking for firmware to fix a broken card, try these standard recovery steps instead: Remove Write Protection
Mxtronics is a common chipset provider for Original Equipment Manufacturers (OEM). This means your specific device might be sold under ten different brand names, even though the internal "guts" are identical. Because of this, there isn't one single "Mxtronics Homepage" for downloads. mxtronics sd card firmware download top
Yes, if the bootloader is intact. Create a recovery SD card on another PC, insert it, and power cycle 5 times. Some MXTronics devices enter emergency flash mode after 3 failed boots. If you are looking for firmware to fix