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I have a 2015 (purchased in late 2016) Macbook Pro with the following specs :

  • 2.5Ghz Core i5
  • 8GB of RAM
  • Running OSX El Capitain 10.11.6

It downloaded Sierra and is asking me to upgrade to the new version.

I want to do it, but I'm worried that the new Operating System will be too demanding for my laptop or that there are some things that I won't like, and I might want to revert in the future.

If I install Sierra, will I still be able to restore my Macbook to factory settings (including El Capitain) by doing a factory restore (where you hold CMD+R while it's booting, and format the drive to reinstall the OS) or will it always default to Sierra instead?

  • If you want to go back to exactly where you were, then you need to clone the HD first. See apple.stackexchange.com/questions/271104/revert-to-el-capitan for the trials & tribulations of trying to do it even with good backups. – Tetsujin Jun 28 '17 at 17:33
  • Thank you, I will look into it. If I don't care about losing any files, installed programs or settings, do I still have to do a backup or a "hard format" back t the factory installed OS will do the trick? @Tetsujin – Drown Jun 28 '17 at 18:10
  • If you need nothing from the previous install, toma's answer is fine. – Tetsujin Jun 28 '17 at 18:17
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Yes, after completely formatting your hard drive and booting in recovery mode from the internet you will be able to install OS version it was shipping with. Also, you can always download and install previous macOS versions from your App Store purchases.

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    flow with complete HDD format was checked by me on my MBPr Mid 2012. There I got OS X Mountain Lion. – toma Jun 28 '17 at 17:03

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