iPhone 6 will not update
Hello, purchased a new iPhone 6 with a contract with Verizon. The phone came with iOS 8.2. I backed it up to my computer, turned off the passcode, and clicked "download and install", or something along those lines. The firmware downloads, but when it goes to install, I get the message, "the software for the iphone "iphone name" was corrupted" Any help would be appreciated, Thanks.
iPhone 6, iOS 8.2