Clear procedure to move back to Mountain Lion from Maverick

Hi,
I had a question related to the purchasing of Moutain Lion on apple store.
Having some trouble with many of my device (for egs 3G key) which are not upgraded (software) to face Maverick, I bought online a version of Moutain Lion to downgrade to this OS for the time needed to see the drivers being uprgraded
But it seems the procedure is quite complex when you have to face a downgrade of the OS.
Is there any clear procedure available to follow to realize such change (answers on forums are numerous but often complex)
Thanks in advance for any response

Here is an excellent and clear user guide:
How to revert OS X back from Mavericks: Apple Support Communities

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    I got a new iMac a week and a half ago. It was running Mtn Lion, with i73.5, 8gb ram. I upped the memory to 16gb and installed Mavericks.
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    You should be calling AppleCare regarding problems with a new Mac. Telephone support is free for the first 90 days of ownership.
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    To revert to an earlier OS X version read: Revert to a previous OS X version

  • If I install Yosemite and find that the wifi problems are too bad, can I go back to Mountain Lion?

    Almost everything I do on my MacBookPro requires a steady wifi connection. I have been reading all the horror stories about the wifi problems with Yosemite. I would like to install Yosemite, but would like to be able to go back to Mountain Lion if the problems are as extreme as I have been hearing.
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    Hi there CarylLynne,
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  • So is it just me, or is Mavericks a bust?  My MBP runs way hotter now. I don't have time for trial and error solutions. Is Apple offering a way to downgrade back to Mountain lion? I want out of Mavericks ASAP.

    So is it just me, or is Mavericks a bust?  My MBP runs much hotter since the upgrade. Why do I need ot sit around watching Activity Monitor, manually controlling my fans, and deleting extensions that I enjoy using. Don't even get me started on the Quicktime/Mov issues. I had none of these issues on Mountian Lion. Searching these forums, I see it's not just me. Why would Apple release a new system w/o peoperly testing it on MBPs?
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    jonny a wrote:
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    Nobody owns a ML install disc - ML was only ever distributed as a download from the Mac App Store.
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