IOS Upgrade Downloading for every device I have many apple devices 5 iPhones and 4 iPads to be exact

I upgrade by connecting to my Mac and then from iTunes

So when upgrading iOS, it's downloading the software every time?

I would understand the reason for having separate download for iPad and iPhone but for all my phones it has to download 1.59GB every time

Which is time consuming and also wastage of my download

Questions
Is there a way to make it so when i upgrade my phones it uses the same file
same goes for iPads
If you have identical devices, even if they are synced to different computers using different iTunes, then this is the way to save the download bandwidth...

You can choose to do the download via iTunes for the first device, or directly by picking the correct ipsw file from https://ipsw.me which simply provides direct download links - the downloads themselves come directly from Apple in both cases.

Assuming you are on Mac...

if you are using ipsw.me then skip this step.


Connect the first device then when asked about the update select "Download Only". This gives you chance to sync &amp; backup first, but otherwise doesn't affect the update. Allow the update to finish, then disconnect the device.
You now have the downloaded file.
If you are going to share this update to other computers, or other Mac user accounts on the same machine, then you need to find it &amp; copy over...  
From Finder, open a new window then hit  Cmd ⌘   Shift ⇧   G  for 'Go To...' then copy paste ~/Library/iTunes/iPhone Software Updates &amp; hit  Enter ⌅ 
Inside there you will see the downloaded ipsw file.  


now rejoin if you got the file from ipsw.me... but remember the path from the last step  


Copy [don't move] this to your other locations using the same method to find the folder, or if the other users are on the same machine, copy to a 'public' folder that all users can see, then get each user to copy from there to their own folder
[each user has their own folder, accessible from their own account using the same path, as in 3. above].
Connect any of your identical devices to iTunes from the correct user account for that user.
You can now begin the standard update process, the update file is already there &amp; will be recognised.