For some reason your disk boot records are messed up. Lets create a bootable OS installer. Get a 32GB thumb drive which you’ll need to format with with GUID and a journaled file system. Down load from here [https://support.apple.com/en-us/HT211683|How to get old versions of macOS] follow this guide to set it up [https://www.macworld.com/article/228350/how-to-create-a-bootable-macos-sierra-installer-drive.html|How to create a bootable macOS Sierra installer drive].
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For some reason your disk boot records are messed up. Lets create a bootable OS installer. Get a 32GB thumb drive which you’ll need to format with with GUID and a journaled file system. Down load from here [link|https://support.apple.com/en-us/HT211683|How to get old versions of macOS] follow this guide to set it up [link|https://www.macworld.com/article/228350/how-to-create-a-bootable-macos-sierra-installer-drive.html|How to create a bootable macOS Sierra installer drive].
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Once but from your other system reboot your MacBook Air using it and this time delete and reformat your internal drive so its fully clean. Now running the installer you should be able to install the OS onto your internal drive. It will automatically setup the partition and install the OS just follow the prompts.
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Once built from your other system reboot your MacBook Air using it and this time delete and reformat your internal drive so its fully clean. Now running the installer you should be able to install the OS onto your internal drive. It will automatically setup the partition and install the OS just follow the prompts.
For some reason your disk boot records are messed up. Lets create a bootable OS installer. Get a 32GB thumb drive which you’ll need to format with with GUID and a journaled file system. Down load from here [https://support.apple.com/en-us/HT211683|How to get old versions of macOS] follow this guide to set it up [https://www.macworld.com/article/228350/how-to-create-a-bootable-macos-sierra-installer-drive.html|How to create a bootable macOS Sierra installer drive].
Once but from your other system reboot your MacBook Air using it and this time delete and reformat your internal drive so its fully clean. Now running the installer you should be able to install the OS onto your internal drive. It will automatically setup the partition and install the OS just follow the prompts.