How to update my iPhone 4 to iOS 7 without losing my pictures and music?

I've deleted everything I can besides my music and pictures but I still don't have enough room but now it seems I can't download anything unless I have ios7 what should I do?

Transfer the music and pictures to your computer, update the iOS and then transfer in back again.

Update iPhone will not delete your files. If you are afraid losing your files, you can use this alternative to iTunes to copy the pictures and music from your iPhone to computer for backup before updating your iPhone. This software worked well for me.

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