06-30-2019 08:21 PM
Have you already gone through the steps detailed in this article? Did you get any error message?
If your camera is a HERO3, please make sure that you extract the UPDATE.zip folder that's downloaded from the website.
Then, copy the update files inside the extracted UPDATE folder (not the UPDATE folder) to the SD card before inserting the SD card back into the camera.
When you power on the camera, the update process will be initiated and completed on its own.
It is important to start with a fully-charged battery and a clean SD card so format the card first.
Let us know how it goes.