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Installing OS onto new SSD

Hello, I recently got a SSD to replace my unibody mid 2009 macbook pro 15” hard drive. The original hard drive itself had been running on El Capitan before I erased it a while back. I have tried reinstalling the OS X on the original drive, but an error keeps occuring.

I have tried restarting holding Shift - Command -Option - R , and thought that would prompt the original Snow Leopard to reinstall, but only El Capitan shows up (probably because it was the last OS that was use) but again the error occurs and I cannot do anything.

I do not have any Time Machine backup.

I have also tried creating a bootable usb of High Sierra on a different Mac that works. I connected the SSD to the macbook pro and plugged in the bootable usb in - but upon restarting, the icon for High Sierra doesn’t look like the actual install icon, but a usb icon. When I click it, only a circle with a slash through it shows up on the screen, then the computer shuts off. I’m clearly doing things wrong but cannot figure out what. Any help would be appreciated!

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You’re hitting an expired certificate issue! All of the OS installers have a certificate which has an window of activation. Apple does this to prod people to migrate to newer OS’s and/or hardware. Here’s a bit more as Apple messed up setting the certificates to expire too soon If you've got an old macOS install image, it will probably stop working today

So what to do… The highest your system can run as you know is OS-X El Capitan 10.11.6 so we a different approach to overcome the certificate issue. You’ll need to back date your systems Date & Time to a point the OS installer will work. I would set the date to Dec 2015

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I was afraid of this - I don’t know why a new SSD would let me upgrade to High Sierra - Thanks for this.

However, I created a bootable USB for El Capitan, but it says the OS cannot be verified and may be corrupt - any idea what went wrong here? Somehow El Capitan was under “Purchased” on my working mac, so I downloaded that from the app store and created the bootable usb. I even wiped the usb first before doing it. Any help would be appreciated!

I also tried to set the date back to 2015, but since my hard drive had already been wiped, there is no way for me to access system preferences -

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Yep, you got the dreaded certificate error! Nothing is wrong with the installer file! Apple wants to scare you ;-}

You'll need to setup an external bootable drive with El Capitan on your working Mac. Then with it you can boot your system up to gain access to the control panel. When you restart your system with the external drive press the Option key to gain access to the startup manager so you can select the external bootable drive.

Reference: Mac startup key combinations

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@danj Thank you! So you mean backdate a working mac to 2015 and then create the bootable usb?

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Yes! Somehow you need to create a bootable external drive that has the required macOS on it. That way you can boot up your older system to install the OS on it.

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This did not work, by the way -I backdated my working mac to Dec 2015 and created the bootable usb with El Capitan - same error showed up "cannot be verified and may be corrupt"

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Claire zal eeuwig dankbaar zijn.
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