How to unistall maverick.

Hi,
after I've installed Maverick on my iMac 27 -late 2012, I have expirienced some problems and I've decided to take a step back to Mountain Lion but, even if the Apple support confirmed that I could re-install the previos OS via the CMD-ALT-R procedure, I wasn't able to do that because a HD different from the Machintosh HD is required. To make it short, since I've a unique driver (Machintosh HD) I can't re-install Mountain Lion on it because a more updated version is already installed.
Since the iMac has no optical driver and I don't own a digital copy of Mountain Lion , even if I've paid for it, how can I format it to factory setting?
Thanks a lot in advance for any kind of suggestion or support.

The only way to downgrade is to erase the hard drive and reinstall the older system. If you hold down command-option-R at startup, that should boot into internet recovery mode, and you will be able to reinstall the original version of Mac OS X that your Mac shipped with (once you have erased the hard drive, using Disk Utility).
Because this will be a bit of work, it's probably best to try to troubleshoot your issues with Mavericks, if possible. Most people are finding it to work pretty well. Most of those who are having problems have incompatible third-party software installed or a corrupt system. See Understanding upgrade nightmares.

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Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your external hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
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                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Dalek Caan (disk0s2) /: 499.25 GB (466.87 GB free)
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I am looking for some advice / help.
I have a Mac mini Early 2009,
I want to replace 120GB Drive with a new larger drive, how do I setup Maverick on the new drive before swapping out.
I do not have my original OS X Disk,
I have purchased OS X Mavericks from App Store.
Is there a way to install on new drive (Via external adapter) before replacing old hard drive?
I have relevance experience and tools to perform task,
I have upgrade the Memory to 6GB previously.
Are there any further upgrade that I can do to my Mac as it is a great little machine and do not currently have funds to purchase one of the new beauties
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http://support.apple.com/kb/ht5911
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I just restored my computer back to Mountain Lion, and she's working perfect again, as I knew she would. E-mail popping into mailbox instantly as it should and did before the update, printer working fast as it was before update, no more freezing or glitches of any kind thankfully and finally. Here is the link that is through the Apple site to direct you on how to put your system back and get rid of Maverick's, that is assuming that is what you would like to do and also includes link for those wanting to try fixing the issue if that is your preference (most of this info is for those with mountain lion and some with the previousverisoin of OS X lion).
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How to unistall maverick.

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