How do I upgrade the camera's firmware? (YI Action camera)

Complete these steps in the YI app:

• Ensure the camera is on and paired with the YI app.
• Select "Settings". 
• Select "Firmware Version".

When updating the camera software to the latest version, make sure the camera is fully charged and your phone has access to the Internet (to download the latest camera software). During the upgrading process, DO NOT remove the SD card and DO NOT turn off the camera manually.

Manual firmware instructions can be found here.