Here is a step by step how-to for preparing the Cohesion3D Mini microSD card with the correct firmware and configuration for the standard Smoothie Firmware.
Step 2. Open the microSD card on your computer via microSD card reader/adapter
Step 3. Format the microSD card in the FAT file format
Step 4. Download the default firmware from here: C3D Standard Firmware
Step 5. Download the standard config file from here: C3D Standard Config File
Step 6. Copy both files onto the microSD card in the root directory (no folders)
Step 7. Eject the microSD card from your computer and re-insert it into the C3D controller
Step 8. Power up the unit and test. You can use THIS ARTICLE to test it.
The official installation guide can be found here: