can you update to a lower version of ios
After a failed installation attempt, you must reinstall the last successfully installed version or a newer version of iOS. You can upgrade an iPhone to a newer version, but beware, you cannot then change back to a lower version of iOS. i.e. Once a phone is on iOS 5.1, you cannot then change it back to iOS 5.0.To do the upgrade, you use the Organiser window in XCode.fter a failed installation attempt, you must reinstall the last successfully installed version or a newer version of iOS. You can upgrade an iPhone to a newer version, but beware, you cannot then change back to a lower version of iOS. i.e. Once a phone is on iOS 5.1, you cannot then change it back to iOS 5.0.