How to update iPhone without losing info?

When i get ready to update is says there are parchased ítems on the iPhone that have not been transfered to your iTunes library. Do i clock continúe and ingore that I dint want to loose my info

Well yea, transfer them to the computer (as part of a backup). Back up before & restore from that backup after. Simple.

Back up your information to iTunes before you update it:
1) Plug your iPhone into your computer
2) Launch iTunes
3) Click on your iPhone in the devices category on the left hand side
4) Click on the back up option if it doesn't back up all of your information automatically

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