jerrykids Posted September 30, 2014 Share Posted September 30, 2014 I just upgrade my MAC book air from MAC OS 10.9 to 10.10, but found the latest version of OS not really stable, it is any way to downgrade the OS back to 10.9? Quote Link to comment Share on other sites More sharing options...
RoseJacobson Posted October 6, 2014 Share Posted October 6, 2014 Restore your device to any back date. It will surely help you, even I faced this problem and restoring helped me Quote Link to comment Share on other sites More sharing options...
cancerman Posted November 30, 2014 Share Posted November 30, 2014 Back it up with Time Machine, restart holding down the Option key and go into the recovery partition, erase the hard drive and reinstall 10.9 from a usb drive, then do a migration from the Time Machine backup. Quote Link to comment Share on other sites More sharing options...
RobertArrington Posted March 15, 2015 Share Posted March 15, 2015 Yeah, if you're able to do a Time Machine backup, you could easily download 10.9 from the App Store, load it on a flash drive, boot from that flash drive and fresh install 10.9 on your HD after wiping it with Disk Utility. Quote Link to comment Share on other sites More sharing options...
vision33r Posted March 24, 2015 Share Posted March 24, 2015 Go to tonyosx86 and download iboot and then download mavericks from the app store to create the USB. Quote Link to comment Share on other sites More sharing options...
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