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xuhaotian 2015-07-04 02:49:14 +08:00
看来只能手动备份。
https://discussions.apple.com/thread/6883801?start=0&tstart=0 It is not possible to downgrade to Mavericks without wiping the disk drive first. The installer will not allow an older version of OS X to be installed over a newer version that is the reason you must erase. |