How to use an ISPW File 

After you’ve backed up your device, connect your iPhone or iPad to your Mac via its USB cable. If your iPhone or iPad won’t boot, put it in the DFU (recovery) mode (click here to see how to put iPad into DFU recovery mode)  before you start this process.











Open the Finder app on your Mac, and then select your iPhone or iPad from the sidebar. Press and hold the Option key, and then click “Restore iPhone” or “Restore iPad.”


Next, select the IPSW file you downloaded, and then click “Open.”



If your Mac asks you to install a device update, click “Install.”

Wait while your phone or tablet downloads and installs the update.


When it’s done, Finder will ask if you’re sure you want to restore your iPhone or iPad; click “Restore.” If this pop-up doesn’t appear after the device update, go back and start the restore process again.



Your Mac will now start the restore process, which can take a while. Make sure your iPhone or iPad remains connected to your Mac. Your device will boot to the Apple logo a few times.




When the process completes, a pop-up will appear that says your device has been restored; click “OK.”





Your iPhone or iPad will now restart, and you’ll once again see it in the sidebar. You can now either restore your data from an iCloud backup or disconnect your phone or tablet from your Mac and set it up like new.


If you have a backup on your Mac (especially if it’s encrypted), it’s going to be much faster to restore from this rather than an iCloud backup. After your device is restored, select it from the Finder sidebar to see the iPhone or iPad setup screen.

Here, select a backup, and then click “Continue” to start the process.

After the process is complete, your iPhone or iPad will be on the OS version of your choosing.