Time and again you need to load a custom .ipsw (iPhone software) file to your iPhone to update or restore iPhone OS. Follow the steps below to load the .ispw file to your iPhone:

Step 1: Download and install latest version of Apple iTunes

Step 2: Sync your iPhone with iTunes

Step 3: From iTunes sidebar, select your device (in devices section on sidebar)

Step 4: Press and hold Shift key (Windows) or Alt key (for Mac) and click on “Restore”. (Important: Don’t click on “Update” or “Check for Updates”).

iTunes Update or Restore

Step 5: Select the location of .ipsw file you want to restore or load on to iPhone

Step 6: That’s all from your end, now iTunes will perform some automated steps to complete the installation. Your iPhone will restart once the progress is complete.

That was simple, eh? However if this process does not work, try it with your device in DFU mode.

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