Tuesday, December 29, 2015

[Avid-L2] Re: Installing older OS's on new MacBook Pros?

 

Here's something from Apple regarding a time machine backup approach.  I have bootable flash drives of 10.7, 10.8, 10.9 and 10.10.  Could I boot to one of them on a new MBP and do a clean install on the internal flash drive or are there those hardware or software blocking mechanisms in place that will not allow that to happen.  I know that's been the case in the past on various hardware firmware for macs.  From Apple:

OS X Yosemite: Revert to a previous OS X version

If you use Time Machine to back up your Mac, you can easily revert to a previous version of OS X if you experience trouble after installing an update.

Important:   Reverting erases any changes you made to the files on your Mac since you installed the new version of OS X. To save new or revised files, copy them onto a different disk or back them up before you follow these instructions.

  1. Print these instructions.

    Click the Share button in the Help window, then choose Print.

  2. Choose Apple menu > Restart. After your Mac restarts and you hear the startup chime, hold down the Command (⌘) and R keys.

    When the Apple logo appears, you can release the keys.

  3. Select "Restore from a Time Machine Backup," then click Continue.

  4. Select your Time Machine backup disk.

  5. Select the Time Machine backup you want to restore. To restore your computer to the state it was in before you installed the new version of OS X, choose the most recent backup that occurred prior to installing OS X Yosemite.

  6. Follow the onscreen instructions.

If you backed up files as described in the Important message above, you can restore them now. If you backed them up using Time Machine, click the Time Machine icon in the OS X Yosemite: menu bar, choose Enter Time Machine, then retrieve your files.

 




---In avid-l2@yahoogroups.com, <bigfish@...> wrote :

I recall a fairly recent thread regarding how to back rev the OS on a MBP but IIRC the suggestion was about taking the hard drive to an external enclosure and and installing an older OS that way.  I've done that in the past on Mac Pros.  I purchased an MBP 13 inch over Xmas and learned that it works off an internal flash drive that is soldered to the motherboard.  Having learned this I'm curious how one can install a previous OS on the internal flash drive.  Is this something that would be done launching the MBP in target mode.  Is it even possible?
 
John Moore Barking Trout Productions Studio City, CA bigfish@...

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