If you don't have Codey Rocky, just buy this device Firstly go to source code. Because you can only connect device on the source code. You can choose upload or live mode. It is optional to attach or detach Codey (Unless you have a bluetooth dongle) To use the upload mode, connect the Codey Rocky that containg "COM". Then, press 'Upload' after connecting mBlock 5.0 or below: Click the 'Connect' button if you're ready. mBlock 5.5.1 or above Click the 'Connect' button. But make sure you need to download mLink first. (If mLink was selected) Click the serial button and select this device and connect it (If direct connection and serial was selected) You can now press the 'A' button to switch the battery type! Please note that delays and glitches may happen.