Snapguide
STEPS
TOOLS
Open settings

Open settings

Go to General

Go to General

Go to Software Update

Go to Software Update

And it will search for update and say IOS 7 Say install but you will need to have 50% battery or connect your Apple device with a charger

Your photos will stay on the Apple device , but its better to keep a itunes backup always

The creator of this guide has not included tools