If you by mistake deleted photos from gopro camera, do not worry, because it is possible to recover deleted photos from gopro. All you need to do is to follow this step by step guide
gopro photo/video recovery solution
You can recover not only deleted photos, but also deleted video files (such as mp4 files) from gopro Hero 5, Hero 4, Hero 3, Hero. Now you do not need to worry about data loss on GoPro camera. You can recover deleted files from GoPro camera memory card, such as sd card, microsd, sdhc, sdxc, sd mini, cf card. You can also recover lost photos after gopro camera memory card reformat.
How to recover deleted videos from GoPro
GoPro video recovery solution
How to recover photos from camera sd card