FLASH OS to eMMC Module:Extract an file and ar on a Window PC. Connect an eMMC module to a -sd to eMMC adapter, insert this -sd adapter a -sd to USB adapter and insert this USB adapter to the Windows PC. Run the win32diskimager utility as administrator. On the utilitys main window select this -sd adapters drive, the wanted file and click on" write" to flashing the eMMC module. After flashing is done the eMMC module of the adapter. Insert the eMMC module to the eMMC slot on a NanoPi K2 and power on (with a / 2A power source) the board. If both the green LED and blue LED are solid on this indicates your NanoPi K2 has successfully booted. When a K2 board has both TF card and an eMMC module inserted it will always from the eMMC module. If you to your K2 from a TF card just insert a TF card only and leave the eMMC slot empty. Colour:random color , 't accept the specified color Material:PCB+ plastic+metal Package Contents: 1 x -SD to eMMC adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.