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1. #REINSTALL OS YOSEMITE MAC OS SIERRA HOW TO#
2. #REINSTALL OS YOSEMITE MAC OS SIERRA INSTALL#
3. #REINSTALL OS YOSEMITE MAC OS SIERRA FULL#
4. #REINSTALL OS YOSEMITE MAC OS SIERRA PASSWORD#

#REINSTALL OS YOSEMITE MAC OS SIERRA INSTALL#

If you haven't created any backups for your Mac, then you'll need the professional Mac data recovery software tool - EaseUS Data Recovery Wizard, to perform data recovery.Shift-Option-Command-R (for Macs upgraded to 10.12.4 and later) or Option-Command-R (for all other Macs): Installs the version of macOS that came with your computer or the closest available version.įor example, my computer is an early 2015 MacBook Pro running 10.13.3, and when I hold down Shift-Option-Command-R at startup and pick “Reinstall macOS” afterward, the machine offers to install Yosemite for me.

If you have backed up your Mac before the reinstallation, you can retrieve your data from Time Machine, an external hard drive, or somewhere else, depending on the way you used to make the backup. Recover Lost Data After macOS Reinstallation If data loss occurred after you reinstalled macOS, you can follow the next part to recover your missing files. Just wait patiently for the process to finish. It's normal to see your Mac restart several times or the screen is white while you reinstall the Mac OS. Don't put your Mac to sleep mode or close its lid during the installation. Follow the onscreen instructions to select the hard drive you want to install the OS on and start the installation.

Select "Reinstall macOS" from the Utilities Window and click "Continue".

#REINSTALL OS YOSEMITE MAC OS SIERRA PASSWORD#

#REINSTALL OS YOSEMITE MAC OS SIERRA HOW TO#

How to Update & Reinstall macOS Without Losing Data Then follow the detailed guide below to reinstall Mac OS via macOS Recovery mode, which enables you to reinstall macOS, restore your files from Time Machine, repair or erase a disk, and more. Remember to back up your Mac to an external hard drive for preventing system update failure or unexpected troubles from happening. Backup all your personal data and even create backups for your present Mac data through Time Machine.Update your Mac Apps to the latest versions.Leave at least 2GB memory and 8.8 GB storage space on your Mac.Follow the tips below to prepare your Mac ready for the new macOS update now: To reinstall macOS on your computer smoothly. Preparations you Need to Make Before You Reinstall macOS Then how to reinstall macOS without any data loss? To provide a double guarantee to the precious data on your Mac, you can make a copy of the files on your Mac before you perform the reinstallation, or equip your Mac with a data recovery tool that can rescue your data after the reinstallation. However, you know what "Slim" means - it's not 100% safe and is still at the risk of losing some data. Thus, as long as you don't choose to erase your startup disk during the reinstallation, you won't lose files. The good news is that, if you follow the instructions strictly to update your Mac Operating System, the chance to lose data on your Mac is quite slim, since a reinstallation just needs to create a new copy of the OS, your existing files stored on your Mac won't be lost. When it comes to reinstalling macOS, users biggest concern is losing data on their computer. The need to update or reinstall your macOS always follow the release of a new operating system, the slow performance of your Mac, or a system crash.

#REINSTALL OS YOSEMITE MAC OS SIERRA FULL#

Full stepsĪpplies To: macOS Big Sur, macOS Catalina, macOS Mojave, macOS High Sierra, macOS Sierra, or earlier Mac operating systems

Full stepsĪfter macOS installation, run EaseUS Mac data recovery software > Scan and recover lost data. Start Mac from macOS Recovery > Select "Reinstall macOS" > "Continue".

2GB+ memory and 9GB+ storage space left on Mac > 45% + battery > Connect to internet.