IOS 7 update for iphone 4 will it delete everything?

I have the iphone 4 and i want to update the iOS 7. Will it delete everything? Like pictures, apps etc?

Only the iOS files are updated. None of your stuff will be touched and will be where you left them when the update is finished.

No, you keep everything it just updates the software so you're good

It deleted everything for me!

Do it delete everything.

It deleted everything from my phone…
anyone have an idea how to get it back?

Nope once you do the update, Everything I mean everything you had is deleted

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