Teach you how to downgrade the iPhone system Downgrading the iPhone system to an older version is not easy because Apple usually only allows the latest iOS version to be signed. To downgrade, users first need to make sure that Apple is still signing the older version of the firmware file (IPSW). The steps include downloading the older version of the IPSW file and restoring the device through iTunes or Finder. However, this process has certain risks and may cause data loss or device problems. In addition, there are some problems after downgrading...