how to update imac 20' mid 2009?
El Capitan 10.11.6 is the highest OS X that a 2009 20" iMac can run.
see > Identify your iMac model - Apple Support
If your iMac is on an earlier OS X version, then you can get El Capitan
El Capitan 10.11.6 is the highest OS X that a 2009 20" iMac can run.
see > Identify your iMac model - Apple Support
If your iMac is on an earlier OS X version, then you can get El Capitan
Why do you want to upgrade?
That model is considered obsolete by Apple and will no longer work on them. I believe they will, however, provide free diagnostic tests if you're having problems. What do you want to update. The most recent system it can run is OS X 10.11.6, El Capitan. Parts will be difficult to obtain.
How much RAM does it have? You can add additional memory yourself but the cost would probably more than the unit is worth.
El Capitan 10.11.6 is the latest version you can run.
How can I update my imac 20' mid 2009?
