How do I update the firmware?

Follow the procedure below.
1) Download the update file from AlphaTheta site.
2) Unzip the downloaded file (some browsers will automatically unzip the file).
3) Connect DJM-S9 and the computer with a USB cable.
4) Start DJM-S9 in the updating mode.
5) Double-click the file unzipped in 2).
6) Start the update as described on the screen.

Download the update file and update guide from the following AlphaTheta page.
DJM-S9　Firmware