The iPhone 5c ships with a plastic enclosure available in several bright colors. The device shares similar internals to the iPhone 5, including an A6 processor and 4-inch Retina display. Along with the redesigned exterior, the iPhone 5c comes with iOS 7 pre-installed. Here are iOS 7 firmware files for the iPhone 5c.
iPhone 5c (AT&T / GSM) iOS 7.1.2: iPhone5,3_7.1.2_11D257_Restore.ipsw