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Original post by: Dan ,

Text:

Your system can support macOS High Sierra (10.13.6) which is the highest OS supported.

To get it you’ll need to get the OS installer from here [https://support.apple.com/en-us/HT211683|How to get old versions of macOS]. You’ll need to create a bootable OS installer from another Mac system following this guide [https://www.macworld.com/article/3204672/how-to-create-a-bootable-macos-high-sierra-installer-drive.html|How to create a bootable macOS High Sierra installer drive]

Then boot up using it using the '''Option (⌥)''' key to get to the Startup Manager so you can select it as the boot drive

Reference: [https://support.apple.com/en-us/HT201255|Mac startup key combinations]

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