Update of the firmware is recommended so that mi.1 can be used in the most optimal condition. To do this, please download the dedicated iPhone/iPad application "Piano Jukebox" (free)from App Store.
7. Keep the mi.1 powered on even after firmware upload is finished. It takes around 30 seconds more to finalize the update.
† If the Upload button has not been active, your mi.1's firmware might be too early(V1). Then "Firmware Update to V2" is necessary by using "mi.1 connect" app. Please watch this video.