What are the key YI 4K Action Camera features? Tao Ma Updated March 10, 2017 05:50 Follow Related articles Where can I find the user manual? Where can I find and download the latest firmware? Is there a QR code for YI 4K Action Camera? Where can I find and download the YI Action app? What are the requirements for my microSD card? Comments 0 comments Please sign in to leave a comment.