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Helpful answers
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Feb 19, 2015 12:34 AM in response to GeraldButtonby rafaespada,With the restore partition you only can reinstal the same system.
If you can install Mavericks you must make a bootable Mavericks USB and install from there. But i think you must format the disk, and i don't know if you can restore a user information from a Yosemite Time Machine to a Mavericks installation.
Now... i think you can't donwgrade but you can remove all and install Mavericks from zero.
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Feb 19, 2015 4:11 AM in response to GeraldButtonby Barney-15E,To reinstall Mavericks, you need to boot into Internet Recovery (cmd-opt-r), repartition the disk, then reinstall.
If you don't have a backup prior to installing Yosemite, there won't be a way to restore your files except manually from a backup. Some things, like the iPhoto Library and Mail, will have been "upgraded" to the Yosemite versions. You will have to manually import those things from the old Libraries, I think.
These were written for Mavericks, but they would still apply: