Tuesday, December 29, 2015

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

 


I take a deep breath and say:

I'm going to say this one more time and I hope it gets absorbed:  IT is NOT recommended by Apple to install a version of operating system that predates the version that the computer came with.  HOWEVER, if you are willing to take the risk and do it anyway, I do recall that it is possible to do so by taking the drive out of the computer, install the older OS on it using another (newer) computer, put it back into the first computer and hope for the best.  You might even be able to install an earlier version by running the computer in Target Mode to install that earlier OS version.  There are 3 possibilities as to what will happen next:  (1)  The computer won't work; won't start up at all or won't get past a certain startup point. (2)  The computer won't start up and you may actually damage something . . . . possibly permanently. (3) The computer will start up, appear to work fine, but may exhibit instabilities or crashes in the future that are seemingly unpredictable and may cost you time and money.
Given the above analysis, I simply say 'DO NOT DO THIS'.  It is not worth the risk.  You have been warned . . . . repeatedly.
BTW, the below instructions most likely were to allow the user to revert to an earlier OS version that WAS SUPPORTED by the computer in question.  If there are Time Machine backups from a particular computer, that means the earlier version OS ran on that computer and was supported by it.  I have not read anything coming from Apple that suggests you can install any version of the OS on a Mac that precedes the version which came with the computer.

DDD

On Dec 29, 2015, at 12:41 PM, bigfish@pacbell.net wrote:

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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Posted by: Dennis Degan <dennyd1@verizon.net>
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