If you cannot find a working download, you can repack official MXTronics firmware yourself using Linux tools. This is legal if you own the original device.
Class 10 or UHS-I is fine. However, older Class 4 cards often fail during the bootloader handshake. Use a Samsung or Sandisk card. mxtronics sd card firmware repack download work
Hence, the process of creating a is the difference between a $300 paperweight and a functioning device. If you cannot find a working download, you