Why Doesn't My 2008 Macbook Pro And 2009 iMac Recognize My iPhone When I Plug It In? The Fix!
When you plug in your iPhone is it not recognized by iTunes only or is it the computer itself? I’m not sure if your 2008 is compatible with the update for iOS. The 2009 might be, but it would barely be compatible.
If the computers are eligible, the update would be in the update options, but you may need to install a little more RAM to help them run better with the install.