HT1222 I CAN'T install the iOS 7.0.2 in my iphone 4. There's an error occured in downloading iOS 7.0.2. What should I do?

I can't install iOS 7.0.2 in my iphone 4. There's an error occured in downloading iOS 7.0.2. What should I do? but my software already iOS 7.tnx

Are you using iTunes to do the update OTA on your iPhone? If its on iTunes and its giving you the error 
I reccomend creating a iCloud backup and then downloading the iOS 7.0.2 .ipsw file and installing it manually from your PC. So follow these steps below to do this. (these instructions are for Windows i dont have a Mac so i don't know what you do haha but if you need it i could help and try.
Connect your iPhone to your PC and open iTunes.
If your iPhone uses AT&T or i think T-Moblie download the file here http://appldnld.apple.com/iOS7/091-9871.20130924.7imYu/iPhone3,1_7.0.2_11A501_Re store.ipsw (its large! about 1.2 GB)
If its a 8 GB AT&T iPhone use this link http://appldnld.apple.com/iOS7/091-9821.20130924.jJ61o/iPhone3,2_7.0.2_11A501_Re store.ipsw
If its Sprint or Verizon use this link http://appldnld.apple.com/iOS7/091-9794.20130924.umlNu/iPhone3,3_7.0.2_11A501_Re store.ipsw
Now once it's downloaded go to iTunes while your iPhone 4 is connected and hold SHIFT AND CLICK "Check for update" and then find where you downloaded the .ipsw file and select it.
It should work if there is a problem please reply and tell me the issue. Oh and btw MAKE SURE YOY DO A BACKUP TO iCloud

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