I got a replacement 5s today, it was already on 8.3 so I did a restore in the latest iTunes, I was going to jailbreak later. After the restore, iTunes pops up with this message: "An update to the carrier settings for your iPhone is available. Would you like to download it now?" I click Download and Update, then I get this next message right away. "iTunes could not update the carrier settings on your iPhone. The requested resource was not found." Any ideas on what is going on? I've never seen this carrier update error before. This is a replacement 5s that I got yesterday from the Apple Store. When I go into Settings > General > Software Update, it's says I'm on the latest (8.3). Also, I'm on Verizon Wireless, my 5s says A1533 on the back. When I do a system restore it downloads and installs "iPhone6,1_8.3_12F70", I'm wondering if that might be the issue? I know there is a iPhone6,1 and iPhone6,2 IPSW file. This phone has not been jailbroken or anything, it's right from the Genius bar. Thanks for the help, bud Edit: And now I start to get this in iTunes. I clicked on iTunes, check for update. It says "An update to the carrier settings for your iPhone is available would you like to download it?".