10 Replies Latest reply: Feb 8, 2012 9:10 AM by Paul_31
llou_sfx Level 1 Level 1 (0 points)

Hello I would like to restore my OS to 10.7.2 after the upgrade to 10.7.3.

 

I have time machine, and backups before and after the fatal update.

But I worked between and created files so I do not want to completely restore my system but only the OS / system part.

Is it possible ?

How does it work with Time Machine ?

 

Thank you for your kind help


iMac, Mac OS X (10.7.3)
  • 1. Re: How to restore Mac OS 10.7.3 from time machine?
    baltwo Level 9 Level 9 (60,125 points)

    See Pondini's TM FAQs for starters.

  • 2. Re: How to restore Mac OS 10.7.3 from time machine?
    John Galt Level 8 Level 8 (36,425 points)

    Baltwo, in another thread I asked llou_sfx to post this question regarding this specific topic, which is to restore his previous OS and only the previous OS, without affecting anything else. His intent was to essentially reinstall 10.7.2 which was installed on his system prior to February 1, while retaining all his work subsequent to that date.

     

    I believe he is comfortable with Time Machine in general.

     

    Here is the subject post that brought us both to this juncture:

     

    https://discussions.apple.com/message/17523168#17523168

     

    I can find nothing specific in James's FAQ regarding exclusive restoration of a previously installed OS, nor anything specific in any KB article, nor any relevant discussion threads. I am working on the assumption this is possible.

     

    The easy solution is to simply reinstall his entire system as it existed prior to the 10.7.3 update on February 1, followed by restoring the individual documents modified since then, but I'd like to know if it is possible to simply restore a previously installed OS version in one step.

     

    If you (or Pondini) know how to accomplish that I would certainly appreciate it.

     

    Many thanks!

     

    (llou_sfx: please pardon me for asking on your behalf... posting a new topic worked, since I was hoping Baltwo or Pondini would respond.)

  • 3. Re: How to restore Mac OS 10.7.3 from time machine?
    baltwo Level 9 Level 9 (60,125 points)

    Thanks for providing the salient details. I defer all TM issues to Pondini, since I don't use it, preferring to rely on bootable backups/clones made with CCC. I also retain the Lion updaters that I beta-tested, 7.0, 7.2, and 7.3, which allow me to reinstall any version w/o being limited to what apple's posted onto their servers (namely only 10.7.3) if one wants to reinstall or use the crappy Recovery HD method. Rather than mucking with TM, I recommend DLing the OS X Lion Update 10.7.2 Client Combo and installing it. That does the same thing, w/o relying on the Internet or TM.

  • 4. Re: How to restore Mac OS 10.7.3 from time machine?
    llou_sfx Level 1 Level 1 (0 points)

    Hello John,

     

    I decided to backup my documents with time machine and to scratch my OS.

    radical solution, but clean method I think.

     

    I am now dowloading Lion... tomorrow I'll install it and I think I'll update it with the 10.7.3 patch.

    I'll try, it worked for thousands of people, why not me ?

     

    then I'll copy my data back.

    I REALLY hope time machine is reliable, all my datas are in there !

     

    All started from a stupid WiFi probelm... very annoying in the end !

  • 5. Re: How to restore Mac OS 10.7.3 from time machine?
    baltwo Level 9 Level 9 (60,125 points)

    llou_sfx wrote:

    I decided to backup my documents with time machine and to scratch my OS.

    radical solution, but clean method I think.

    IMO, a waste of time, bandwidth, and electricity. I again suggest trying the 7.2 COMBO update. As for any WiFi issue, I don't use it, so can't address it.

  • 6. Re: How to restore Mac OS 10.7.3 from time machine?
    John Galt Level 8 Level 8 (36,425 points)

    Baltwo, I was 99% certain that one cannot install a previous OS update over a superseding version, so I tried it:

     

    Screen Shot 2012-02-07 at 7.07.59 PM.png

     

    Now I'm 100% certain. I believe the only way to "downgrade" is to use TM as llou_sfx did, unless one had a retail Lion USB stick and I'm not even sure about that.

     

    Is there something I'm missing?

  • 7. Re: How to restore Mac OS 10.7.3 from time machine?
    John Galt Level 8 Level 8 (36,425 points)

    I decided to backup my documents with time machine and to scratch my OS.

    radical solution, but clean method I think.

    Radical yes, but this method will certainly wipe the slate clean.

     

    I have done it myself several times, attempting to diagnose the Wi-Fi issue. TM is a blessing.

     

    I suggest you try 10.7.2 for several days, and if you have the patience, try the 10.7.3 update again. If the problem recurs you will have become an expert with "downgrading" since you will have to do that all over again, unless you want to wait for another update.

     

    Who knows, maybe 10.7.4 will fix it for you and break it for me

  • 8. Re: How to restore Mac OS 10.7.3 from time machine?
    baltwo Level 9 Level 9 (60,125 points)

    Then, I was mistaken, but haven't tried it. All I can suggest is to use an earlier installer rather than the COMBO.

  • 9. Re: How to restore Mac OS 10.7.3 from time machine?
    llou_sfx Level 1 Level 1 (0 points)

    Hello John,

     

    Work done !

    it hasn't been as easy as hoped, but it finally worked.

     

    --> install Leopard OS from DVD

    --> download and install lion from App Store (already in 10.7.3)

    --> copy of my data

     

    what a relief, I haven't lost anything.

     

    I didn't understand at first how time machine worked, so it created another user on my new OS.

    I wanted to suppess the user, and it took ages, sooo long so I had to shut the computer by holding the power butter 5 secs.

     

    Clean reboot, everything seems OK. I tried to check permissions and there are files with wrong permissions. Just a bunch, but auto repair do not work.

    Someone have an idea to repair this ?

    Capture d’écran 2012-02-08 à 16.40.19.png

    The OS is working fine anyway.

     

    RESULT :

    the Wi-Fi is back, and behaves normaly. The computer goes to sleep, wakes, then the WiFi is automatically back.

    Well I should try it for a couple of days.

     

    Moreover, the system seems more responsive and faster than before. It was already good, now it is excellent.

  • 10. Re: How to restore Mac OS 10.7.3 from time machine?
    Paul_31 Level 6 Level 6 (12,780 points)

    There are some permissions that never get fixed. Here's a list of those that can safely be ignored:

    http://support.apple.com/kb/TS1448?viewlocale=en_US&locale=en_US