If you own a Sena 20S Evo, you may want to update the firmware on your device. This guide will show you how to do this. First, make sure that your Sena 20S Evo is connected to a power source and your computer. Next, open the Sena 20S Evo’s software and click on “Firmware Update”. On the next screen, click on “Update Now”. The firmware update process will start and may take a few minutes to complete. Once it is done, click on “Close” in the software and disconnect your Sena 20S Evo from the computer. ..