Mactracker app store3/28/2023 ![]() ![]() > Today, I fall back to plan C - take my HD Toaster & backup HD with > 10.8.5 and CC duplicate it on those HD's. ![]() But, still, no way to > download Yosem ite, El Capitan or Mavericks or any older OS X - the > Apple support page had the download buttons for those options > 'greyed' out. > After attempting a Sierra install and failing (message to the effect > ' can't do that '), I connected FireWire 800 and booted TDM in the > newer iMacs then the older iMacs came up ok. ![]() > The campus OIT dept will completely wipe, 7 times overwritten, iMac > HDs and they are left unformatted in the machine - but with PC HDs, > those are removed & several holes drilled into each one. Trouble is with the > 'older' 2.66 GHz Intel Core 2 Duo models. > This time, simply using an OS X Sierra USB installer only worked on > iMac units that were built in 2012 or later. > So, I've just bought 6 iMacs from our university's sale site, > - which I've done several times over the past 15 years. > Great group, I read posts almost every day, sharing what I've learned > with co-workers that own Mac's. Good luck! Denver DanOn Sat, 07:40:59 -0500, Mark McLain wrote: I think James S aimed you at function links for downloading older versions of OS X. USB and now USB C and maybe a Thunderbolt cable? A couple of adapters such as Thunderbolt to FireWire. FireWire 400 and 800 cables might still be necessary. An Ethernet cross-over cable is not longer necessary. I use to carry in my Mac kit bag a variety of cables to work with different era Macs. So the macOS X 10.12.6 Sierra Combo Updater dmg file will update all versions of X 10.12.6 Sierra back to 10.12.0. The Combo Updater system updater updates all previous versions of a major OS X back to the first iteration after a major upgrade. ![]() You can download the Combo Updater dmg files from Apple and put them on a flash/thumb drive or an external portable HD and use them to update. With Disk Utility you can reformat an HD and then install a clean system on it. The bootable OS X installer on a flash/thumb drive contains it's own Disk Utility, Terminal, and other items that are very useful. > For older systems, I used to make a bootable DVD system install disc. The flash/thumb drive should first be reformatted for MacOS Extended (Journaled) and when High Sierra arrives that would change to, I think, APFS. Then you need to know the Terminal command line command that makes this happen and it's automatic after that. Instructions are available on line from places like OS X Daily and MacWorld. Start making a bootable OS flash drive installer for each OS. I urge folks to make a donation for such useful free software!! New updates arrive several times a year for MacTracker and the app alerts you to those. MacTracker is extremely useful and it's donation ware. It has info about what computer runs what OS when made and the latest version that item can run. MacTracker is a database of every product Apple has ever produced. Download MacTracker app from the Mac App Store. Howdy.Mark, if you will be doing this type of Macintosh service on into the future I have some suggestions to make life easier. ![]()
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