how to update iMac mn413ll/a to highest iso
how do i upgrade iMac mc413ll/a above the current El Capitain
iMac 21.5″, macOS 10.13
Question marked as
Exactly what year model is your iMac?
see > Identify your iMac model - Apple Support
An Early 2009 iMac can only run up to El Capitan 10.11
A Late 2009 iMac can be upgraded up to High Sierra 10.13
If you actually have a Late 2009 iMac that is running El Capitan 10.11
you can get High Sierra 10.13 from > How to download macOS - Apple Support
