I have download a update and want to delete it Iphone 4s?

I have Iphone 4s 16gb, and i downloaded an update of ios7.0.2 i guess, and i have ios7. I downloaded it accidentally and i haven't install it. I want to remove this downloaded update because it shows me a notification on settings icon and every day on 21:00. How can i delete it and not to bother me again.Cause i'm afraid that if i install it, it will restart and my iphone won't turn on again, cause when i turned off my iphone whenwas 15% battery, it didn't turn on. And i'm afraid if my iphone do the same thing even that i didn't installed any update when i turned it off

Electronic needs to be rebooted at least once per day… Or else, you device becomes buggy. I don't give 2 @#$^@# if your device is an iphone, android, blackberry, windows, or $20 walmart flip phone… Reboot it! Update it!

And "**** happens"… Factories make defects… Your previous iphone is proof of that… No factory is perfect!

Grow the hell up! Update your Iphone… If it breaks, get a free iphone from Apple under warranty… 'Nuff said