In order to install any firmware or do any modification or update to your action cam you need to download and install the app from PLAY STORE for android.Its very easy to link the app with your camera. Just turn on the wifi on the camera and your phone and press the link button on the app.You can download a custom firmware that write video at 35mbps from
Here. Before you do that though you need to find your
build number. To do that you just open the app and on the settings you will find the serial number for your device. Look for the first 3 or 4 numbers in order to figure out what firmware is good for your device. After that you can follow the instructions from the download link.Your battery needs to be more than 70% before you start flashing the firmware. To flash the firmware, after copy the file on your root directory, you just open the camera and wait until all the beeping is over. That's it. Now you can write videos with better quality at 35mbps. Leave a comment if you have any question!