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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Help I deleted my operating system!

Hi all,

I am trying to upgrade my Mid-2012 Macbook Pro so I started by erasing my hard drive.

I am a noob so I messed up and didn't realize it would delete my OS also. I was on Mojave. 

Now, when I do CMD+R at startup, it only offers for me to reinstall LION.

Does anyone have any advice? 

I really would like to be on Mojave because it is much better and faster….., right?

I'm planning on putting in a new battery, a Samsung 860 EVO SSD, and 2x8GB of Corsair RAM after that.

Does anyone have any good advice they can offer in this situation? Thank

Answered! View the answer I have this problem too

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If you have an external Time Machine backup, do a restore from that.

If not go ahead and install the Lion, then download and install the Mojave.

Get an external backup drive!

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2 Comments:

Thanks for your reply Mayer!

So a little update: After much difficulty, i now am seeing the option to install Catalina. I have two options of where to install it... Should i install it to BootCamp disk or to Macintosh HD disk?

Thank you very much

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You want to install onto the Macintosh HD volume.

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Cory S will be eternally grateful.
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