Re: [Avid-L2] Upgrading OS on early 2009 24 inch iMac stops at Yosemite 10.10.5?

You might not be able to jump from Mac OS 10.10.5 to 10.11.6 - you might need to go to 10.11 first. Boot ROM / SMC version might need to be updated on that computer before moving to a later El Capitan version.

I use the iOS app Mactracker to navigate thru Apple software, computers and devices over the years… very handy to have on your iPhone/iPad

David Baud

Colorist & Finishing Editor

david at kosmos-productions.com

On Apr 2, 2020, at 19:38, John Moore <bigfish@pacbell.net> wrote:

In upgrading some older mothballed iMacs at work just because I see on the OWC chart that I should be able to load El Capitan on these early 2009 iMac 9.1 24 inch models but I can go up to Yosemite 10.10.54 but when I try to install El Capitan 10.11.6 it goes through the whole process of upgrading and at the end say something like no packages could be installed.  At this point it has munched the drive so it is no longer seen as a start up drive in system preferences.  I can reinstall Yosemite to the munched drive and it comes back to where it was before the El Capitan install was attempted.  It still has the few programs I had installed so it's more like the reinstall is fixing the system on the drive.

Curious is OWC's compatibility chart wrong in this regard?  Other newer iMacs l2.1s will take El Capitan at work

There is a note on the chart no blue tooth Handoff.  I think that has to do with blue tooth connectivity for certain tasks but I'm not familiar with hand off.

John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net