MAC: How To Install OS X After Formatting Your Hard Drive – Factory Reset / Fresh Reinstall OSX

In this video I show you how to reinstall MAC OS X on your apple computer. This method should work on all apple computers and with all recent versions of MAC OS. For this guide I used a friends Macbook Pro that they had accidentally formatted the entire hard drive on, erasing all of their information but also the operating system. The Yosemite installer application (Install OS X I use was downloaded from the app store.

To follow this procedure you will need a flash drive / USB stick of at least 8GB capacity and another (working) apple mac or computer running MAC OS.
This process can take a long time depending on the speed of your USB drive, I recommend using a USB 3.0 stick in a USB 3 port.

IF YOU GET THE “This copy of the install OS X (VERSION NAME) application can’t be verified. It may have been corrupted or tampered with during downloading.” ERROR WHEN INSTALLING…
You need to change the date / year on the computer using the command line (terminal) as shows in the video at 9:13 – The most important part of the date is that the year should be set to the same year that your installer was downloaded.
You can view this by right clicking on your “Install OS X” file and choosing “Get Info”, then reading the year under “Created” or “Modified”.

Names of commonly used MAC OS installers: (from the app store)
Install OS X
Install OS X
Install OS X El
Install macOS
Install macOS High
Install macOS
Install macOS

Command for the terminal to create your USB stick:
IMPORTANT: Remember to modify it (as shown in the video at 3:16 ) for your version of the Mac OS X installer!
– – – – – – – – – – Yosemite USB Creator.txt – – – – – – – – – –
sudo /Applications/Install OS X –volume /Volumes/USB –applicationpath /Applications/Install OS X –nointeraction
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

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Tested and working 100%, multiple times by myself using Mac OS X Yosemite & El Capitan on Macbook Pro’s.
This should work fine with all other versions of Mac OS X and all other apple Mac computers! Including Macbook Pro, Macbook Air, Mac Pro, iMac, Mac Mini, Apple Laptops, Macbook & iMac with Retina or 4K / 5K Display and more.


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  1. I just finished my new website with links to social media (Facebook, Twitter, etc..) so you can easily find and follow me for updates:
    I also added the ability to tip/donate to show your support after a few suggestions from viewers:
    I really appreciate all the support and kind comments I receive showing your thanks. Any Tips/Donation support is massively appreciated and will go back into making stuff for the channel. I offer everything I do for free without expecting payment from anyone for it, this is optional.
    Simply leaving a video like, commenting to say thanks or following me on social media shows your support.

  2. I can't find the mountain lion installer app but only pkg… so it dosen t work at all…

  3. after pressing alt/option, the bootable usb isnt showing up. how do i fix it?

  4. after Formatting ssd how you do all things recovery things if you dont own another Mac ?

  5. Can you update to another version of MacOS after this?

  6. If you have one of those Mac os x installation disc you can use that instead of the usb

  7. 🖕🖕🖕thanks sir for your good work after long search you help me

  8. 🖕🖕🖕thanks sir for your good work after long search you help me

  9. 🖕🖕🖕thanks sir for your good work after long search you help me

  10. 🖕🖕🖕thanks sir for your good work after long search you help me

  11. 100ETHICS is like a brother to all!
    I love the way he helps people in this problem.

  12. yeap, not everyone haves to macbooks…

  13. Many thanks Mate. Your video with its Wide Range of information was sooooo useful and helped me Find the right way.

  14. I followed the instructions but when my mac starts to boot up it goes to this screen that says your Mac has retarded because of a Problem…..any help?

  15. is there a way I can do this with a windows I only have a mac and windows not two macs

  16. what command would you run on a mac os Catalina. Getting a Command not found

  17. where did you put the source OS? if its in my desktop, should I change the terminal command somewhere? Thank you!

  18. Great video. This is exactly what I needed.

  19. Tu peux le faire un video avec pc windows

  20. Comment en faire avec pc windows

  21. Why my macbook pro 2009 model, can't open macos utilities window using the command+R or shift+option+command+R. Please help

  22. is it the same process even when installing windows 10?

  23. It tells me that the command is not found

  24. The video you need when you fuck up with the format 🙏🏻

  25. Is there a way to do this but use windows instead

  26. You guys dont need any usb, just shut down your mac and hold command + R and turn the mac on and keep holding Command + R. Then just download the given mac os over internet, if u get stuck.. change the date some years earlier if your mac is trying to install older OS but not managing to download it. Macbook pro mid 2012 here

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