Where can I download iOS 8.x firmware / IPSW files for the iPhone 6?
The iPhone 6 launched along with iOS 8.0, a 4.7-inch Retina HD display and A8 processor. There have already been several updates and bug fixes issued for iOS 8. Here are links to the official IPSW files for the iPhone 6:
iPhone 6 iOS 8.1.1: iPhone7,2_8.1.1_12B436_Restore.ipsw
iPhone 6 iOS 8.1.0: iPhone7,2_8.1_12B411_Restore.ipsw
iPhone 6 iOS 8.0.2: iPhone7,2_8.0.2_12A405_Restore.ipsw
iPhone 6 iOS 8.0.1: iPhone7,2_8.0.1_12A402_Restore.ipsw
iPhone 6 iOS 8.0.0: iPhone7,2_8.0_12A365_Restore.ipsw