The downgrade process requires you to erase your startup drive and lose all your current data, so be sure to back up your Mac before proceeding. In addition, there's no guarantee that any user data that was created with a version of OS X that post-dates Snow Leopard or the apps that created them will be usable with Snow Leopard. In many cases, your user data is transferable. For example, a photo in any of the standard image formats should work just fine with Snow Leopard, but your Apple Mail messages may not be readable by the Snow Leopard version of Mail because Apple changed message formats in some of the later versions of OS X.
This is just one example of the type of issues that may surface when downgrading from one version of OS X to a previous version. If you're willing to try the downgrade process, create a clone of the current Mac startup drive on a bootable external drive that is not your current startup disk.
Remember, this process erases all the data on your startup drive, so — to repeat — have a full, current backup of your data before beginning the downgrade process. Actively scan device characteristics for identification.
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Facebook Twitter. Updated on September 11, Tweet Share Email. Apple Macs iPad. In This Article. Can I Upgrade? Minimum Requirements. Grand Central Dispatch. OpenCL Supported Chipsets. Viewed 3k times. Improve this question. Possible duplicate of apple. I wouldn't advise using Lion Even if you don't care about the general improvements in capability and in my opinion usability with the latest OS, Lion is no longer supported by security updates and you will find many more recent apps won't work on it and some websites may also fail to work well on Lion's version of Safari.
Consider partitioning your hard disk or using an external disk so you can keep If you had it previously you should be able to download from the App Store by signing in to the account you used to obtain it in the first place. If it came with your computer, you may have an OS restore disk do they still include those with new Macs? Or, perhaps, it's simpler to upgrade the software you are not currently able to use? Add a comment. Active Oldest Votes. Improve this answer. The above included what to do in order to upgrade from Snow Leopard to Lion using your bootable flash drive.
Jan 17, PM. Kappy I really appreciate you helping me. I did go through all those steps but at 5 I get that message box that comes up and will not install snow Leoopard. Like the box says - I have to either reboot or restore from backup. I went down both of those roads with no results. When I reboot it just send me around the circle again.
So I'm having a hangup there. Actually I just tried it again and after I click the language, it pulls up this dialog box and the Utilities are greyed out and unaccessible.
That is the same dialogue box above. In the past I just chose the back up option which allowed me to access the pull down menus in order to access disk utilites. When I experimented trying to restart from a utilities pull down menu "startup disk and chose the CD" then I get this. Note the "preparing for installation" -- it acts like it is going to install but then this message pops up again. I don't believe you have a valid Snow Leopard installer DVD but rather some kind of update disk which would explain the error dialog.
Jan 18, AM in response to kidquotes In response to kidquotes. When you bought this mac did you get the original install disc s that were supplied with it new, there may be two. If not you may have to obtain a retail copy of So maybe a bit more hunting needed. Jan 18, AM. I don't want this. I don't want El Capitan, period. I get a message stating, your version of the OS is older than the one installed and it won't downgrade. Jan 22, AM. After choosing my language, I am presented with my drive choices and the internal is not an option!
More Less. Communities Get Support. Sign in Sign in Sign in corporate. Browse Search. Ask a question. User profile for user: kidquotes kidquotes. Reply I have this question too 4 I have this question too Me too 4 Me too. All replies Drop Down menu. Loading page content. User profile for user: Kappy Kappy. Immediately upon hearing the chime hold down the C key.
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