If you are using an SD card for a device firmware update (such as for a 3D printer or mining rig), follow these general steps: Ameco / Micov / MXTronics - USBDev.ru
For older MXTronics devices (pre-2020), the company maintains an anonymous FTP: mxtronics sd card firmware link download
Once you have obtained the correct firmware link and downloaded the .img or .zip file, follow these steps. Incorrect writing can render the SD card unusable. If you are using an SD card for