Select an update method:
If the standard system update method is inaccessible or not working, you can try an alternative update method.
Updating the system (standard method)
Updating the system using the built-in setup network
Updating the system using a computer and USB cable
Updating the system using a USB drive
Updating the system using the Safari browser and Bonjour
Get help if the update won't install.
If you have trouble installing the update for your product, see Software or firmware update will not install
Get help checking the version of your product.
For help determining the version of your system, see Checking the software or firmware version
, then compare that version to the latest one listed in Software and firmware versions