Latest Apple iOS 11.3.1 Firmware downloads
April 25th 2018 - iOS 11.3.1
iOS restore files (ipsw’s) are requested and downloaded on demand by your computer (iTunes on Mac/PC, or Configurator on Mac), but you can speed up your device management by downloading the ipsw's in advance of needing them.
Following are links to the latest firmware for the most recent Apple devices, and instructions on where they need to be stored on a Mac for them to be recognised by iTunes or Apple Configurator
Apple Configurator 1.X Users
Copy the ipsw files to the following location. To save disc space it’s always a good idea to delete old ipsw files from this location before copying in the new:
Apple Configurator 2.X Users
The code before ‘group.com.apple.configurator’ may change depending on your local configuration.
Copy the ipsw files in the one of the following locations, depending on product type. Again, it’s good practice to delete old ipsw files from these locations before copying in the new:
~/Library/iTunes/Apple TV Software Updates
~/Library/iTunes/iPad Software Updates
~/Library/iTunes/iPod Software Updates
~/Library/iTunes/iPhone Software Updates
Here are links to all of the most often required ipsw files. Please note that in the case of the cellular devices the links are to firmware for the standard UK specification models (in some cases other models are available for international cellular networks):