1：Download and copy the bin file to the root directory（Parallel to the DCIM folder） of microSD cards (Please format the card to FAT32 firstly).
2：Power the camera with microSD inserted, the update will follow automatically.
3：Red LED will be blinking while upgrading. when the upgrade completes, the camera will restart automatically.
Here is a video you may refer to,
You may also get more from the blog.