Follow the procedure below.

1) Download the update file from AlphaTheta support site

2) Unzip the downloaded file (some browsers will automatically unzip the file)

3) Connect DDJ-RX and the computer with a USB cable

4) Start DDJ-RX in the update 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 support page.

The latest version of Java needs to be installed on your computer to perform the update. If it is not installed, download it from here and then install it on your computer. If you attempt to download Java with the Edge browser in Windows 10, the "In Windows 10, the Edge browser does not support plug-ins and therefore will not run Java. Switch to a different browser to run the Java plug-in." message will be displayed, but click [Agree and Start Free Download] below the message to download Java anyway.