If you were running the final beta (beta 6) of iOS 7 on your iOS device, and you’re finding that you’re getting a “could not activate iPhone” message, here’s how to fix it.
Fortunately, a fix is available – such as the one detailed at iPhoneHacks. The executive summary is to make sure you’re running iTunes 11.1, manually download the latest 7.0.2 version of iOS , connect the device to your Mac, click on the device in iTunes and then hold down the option key when clicking the Check for Update button to select the downloaded file.
Detailed instructions, along with links to the files for each device are available here.
