It somehow happened without my knowledge. I found all my photos gone after updating my iPhone 7 to iOS 10.0.2. That's not cool! How could it just happened like this, I've used my newly bought iPhone 7 to capture the memorable moments during my trip in France, and they were all gone.
Thanksfully, a friend of mine who works in iFoneTips recommended me to give it a try on iPhone Data Recovery. To be honest, I didn't think it will work in the first place. However, the truth is that it works totally out of my expectance. It retrieves almost all photos back on iPhone 7. Thus, I'd like to share my story to you. Hope it works.
How to Recover Deleted Photos from iPhone.pdf