If I update my iPhone 4, will I loose everything?

I had restored my iPhone after it fell in water so I had lost everything (obviously) and before it fell I didn't update the software or whatever and when I restored it it had the update. So when I was on iTunes on my computer, I forgot what I had clicked but it said that I was supposed to update my phone on the 22, I think, and I was worried about loosing all my pictures and apps on my phone. So, if I update my iPhone, will I loose everything? Sorry for the long story btw.

No you will lose nothin

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