Chosen Solution
I’m having an issue creating bootable USB installers for multiple versions of OSx. I download the files directly from Apple’s website, then I copy and paste their terminal command to install it onto a blank USB drive, and with both el capitan on the 15” A1286 from 2008-2009 models I’m not able to install with the USB. It runs like it’s installing just fine, then at the end I get an error message like in the attached photo
Same thing happens when I try to install the High Sierra from USB that I downloaded from Apple.com and created using their terminal command. Is there some way to create USB sticks from the downloads directly from Apple?? Here’s where i’m downloading from How to create a bootable installer for macOS But for some reason no matter how many times I create these USB installers, they never work. Any solution would be helpful
I’m suspecting you are hitting a certificate issue. Here’s a bit more on it If you’ve got an old macOS install image, it will probably stop working today Apple released updated installers with new certs. Here’s the collection! How to upgrade to OS X El CapitanHow to upgrade to macOS SierraHow to upgrade to macOS High SierraHow to upgrade to macOS Mojave In all of these you’ll want to jump to Step 4 and look for the second Blue URL as the first is for Catalina! Apple want to push you to it. As far as setting up the USB, do make sure you’ve formatted it GUID with a journaled file system (HFS+) before you move over the installer. Some of these are compressed so you’ll need to double click on it twice to launch the installer, then from the menu exit out. The last issue is you need to run the setup on an older OS and on a system the OS can run on. Apple loves making this hard! So as an example you have a 2018 MacBook Pro you can’t setup El Capitan on it. Update (10/25/2020) Back Dating your system:
