IMAC出厂个阵系10.9 可唔可以downgrade 落10.8?

我部IMAC 系2013 年 21.5'
一出厂就系10.9
想downgrade 落10.8 O唔Ok？

因为我见downgrade 教学原厂都系10.8 既

10.8要钱WO

Is there any reason why you have to go with 10.8?

BT Mountain Lion Installer 试下囉。

HomeHow to Mac Software How to roll back Mac OS X 10.9 to 10.8 (and earlier)
How to downgrade Mavericks to Mountain Lion. How to roll back Mac OS X 10.9 to 10.8 (and earlier)
Guide to downgrading from Mac OS X 10.9 Mavericks to Mac OS X 10.8 Mountain Lion

by Lou Hattersley |Macworld UK | 20 Dec 13



Are you wanting to downgrade Mac OS X 10.9 Mavericks to Mac OS X 10.8 Mountain Lion? Or maybe even further back, to Lion? The good news is that you can roll back your Mac to the operating system that was first installed on it using a Recovery Disk.

Then our guide to rolling back the Mac OS X operating system to an earlier version has the information you need.

First of all it’s worth noting that you cannot simply take Mac OS X back to an earlier edition and keep all of your files. When Mac OS X updates to the latest version it updates the file structure in apps like iPhoto, iTunes, Calendar, Mail and so on. Apple doesn’t create any system that enables you to roll back to an earlier version and keep all these files, so you can’t take these files with you.

Also, maybe Mavericks isn't so bad after all: here are our 10 favourite features in OS X 10.9 Mavericks.

But it is possible to perform a clean installation of the older operating system, and you can also backup your current data and then start to transfer it across.

It’s by no means easy to roll back to an earlier operating system, and we wouldn’t advise it unless you have a real need to be on the older operating system (say if you have a vital program that requires the older operating system, or you're testing out on an older operating system). But for general use Mavericks is better than Mountain Lion in almost all respects (including speed) so we’d suggest you stick with the newer operating system if possible.

Step 1: Get a copy of Mac OS X Mountain Lion
Check for Install Mac OS X file

The first thing you need to do is get a copy of the Mountain Lion installation file. You may already have this if you’ve done an install before. Open the Applications folder and check for the Install Mac OS X Mountain Lion folder.

If you haven’t go this file, then you’ll need to go hunting for it. If you purchased it from Apple then you can open the App Store, and click on Purchases. Look for the Mountain Lion purchase and click on Download next to it. This will download the Installer file to your Applications folder.

If you haven’t purchased it you need to buy a copy from Apple. You can’t buy one from the App Store. Instead click on this link to buy a copy of Mountain Lion from Apple (for ￡14) You receive a code that you can enter into the App sTore to download the app.

See: How to buy old Mac OS X software: pick up older operating systems for Apple Macs

Step 2: Download recovery Disk Assistant.
Get recovery assistant

You can get a copy of Recovery Disk Assistant from Apple. Click here to get Recovery Disk Assistant (click Download). You’ll need this. Double click the Recovery Disk Assistant.dmg file in Downloads to continue.

See: Hands on with Lion Recovery Disk Assistant

Step 3: Create a recovery install disk
Erase Drive

Now create a recovery drive. This is an external drive (usually a USB Flash drive) that you use to create a recovery disk. Follow these steps

Open Disk Utility (click on Go, Utilities and double-click Disk Utility)
Select the recovery drive in the sidebar and click on Erase
Ensure that the Format is Mac OS X Extended and click on Erase and Erase.
Click Partition and change Current to 1 Partain
Click options and select GUID Partition Table.
Make sure the format for the partition is Mac OS Extended (Journaled).
Click Apply.
Now open the Recovery Disk Assistant program. and click on Agree. Click and choose the external hard drive in the middle of the window and click Continue. Enter your password and click OK.

See: Apple Support: Erase and reinstall OS X

Recover Assistant

Step 4: Clone your hard drive
It’s important to make a clone of the whole hard drive and keep it around for a while. This can be useful in case of emergencies (you can boot from the hard drive) and you can re-clone it back to the main drive if there’s a problem. Also you can keep this around and pick files from it to copy over to the rolled back installation. The best way to do this is using a program like Carbon Copy Cloner or SuperDuper along with an external hard drive. Choose your main hard drive in the source, and your external hard drive in the Destination. Now click on Clone.

See:

How to recover your Mac from a back up
How to reset a MacBook: restore your Mac to the original factory settings
Step 5: Restart the Mac in Recovery Mode
First of all make sure you are connected to the Internet (open Safari and browse around). You need an internet connection to install Mac OS X. Restart the Mac by clicking on Apple > Restart and hold down the Command and R keys until the Recovery Mode Utilities window appears.

See:

Apple Support: Mac OS X Recovery
How do I restore my Mac with Time Machine
Step 6: Erase the drive
Select Disk Utility and click on Continue. Now choose your Startup Disk in the sidebar on the left, and click on the Erase tab. If you want to securely erase the drive choose Security Zero Data One-Pass. Click Erase to delete the hard drive. Note that this permanently erases all data on the hard drive so don’t do this unless you’ve cloned the drive or are happy to never have to get something from that drive again. When Disk Utility has finished exit the program by choosing Disk Utility and Quit Disk Utility.

See:

Apple Support: Disk Utility
Macworld Help: Securely wipe your hard drive
Step 7: Reset and restore
Reset the Mac and hold down the Alt key and choose the Recovery USB drive. Install the OS X version that is provided with Internet Recovery, it depends upon what originally came on the machine (typically it will be either Lion or Mountain Lion). Note that if you have a Mac with an optical drive you can also use the installation disc to install direct to that operating system.

To find out more about Mavericks, read our Mac OS X Mavericks Review. Also, find out how to Get your Mac Ready for Mavericks and we answer the question: Mac OS X Mavericks vs Mac OS X Mountain Lion: should I upgrade?

We have also published a series of tips on how to master Safari in Mavericks, and tips for how to use Calendar in Mavericks. You can also find our Maps tips here, our Mail on a Mac tips here and you can read our iBooks on a Mac tips here. Finally, read how to use two screens at the same time in Mavericks.

大部分人期待紧 10.10

因咩野理由你要down 番 10.8？

因为我之前买左只software,但旧版本所以10.9 唔support，
咁又无理由比几钱蚊再买，咪想downgrade lor

你因住因小失大

其实我都想知Mavericks夹adobe既问题系唔系已经解决晒? 我都想升cup...

其实我都惊 但software 又2千蚊， 所以睇定啲做下功课先

如果你之前有整到10.8既开机手指/碟, 可以clean install过

要肯定做左TM backup先

https://www.youtube.com/watch?v=2oDHgm3OFdQ

开机手指
https://www.youtube.com/watch?v=Q247rzjDX_g