FLASH OS to eMMC Module:Extract an image file and ar on a Window PC. Connect an eMMC module to a Micro-sd to eMMC adapter, insert this Micro-sd adapter a Micro-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 Micro-sd adapters drive, the wanted image file and click on" write" to start flashing the eMMC module. After flashing is done take off 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 boot from the eMMC module. If you want to boot your K2 from a TF card just insert a TF card only and leave the eMMC slot empty. Colour:random color , don't accept the specified color Material:PCB+ plastic+metal Package Contents: 1 x Micro-SD to eMMC adapter