![]() If the format is wrong, you will not be able to install the OS, nor a bootable installer. Or, if you have a TB cable, you can connect the two Macs, and install Sierra right on your Mac.Īlso, post how you are formatting the potential install drive. ![]() I am referring to installing the OS, not creating an installer. Bootable USB Stick for macOS X Catalina 10.15 - Full OS Install, Reinstall, Recovery and Upgrade Brand: Generic 149 ratings Price: 20.00 Get Fast, Free Shipping with Amazon Prime FREE Returns Frequently bought together + + Total price: Some of these items ship sooner than the others. If could you put her Mac in Internet Recovery Mode by holding Shift+ Option+ Command+ R at startup (this installs the OS that came with the Mac from the Internet which should be Sierra), she could just install the Sierra OS right on the Thumb Drive. I am unsure if it would open on your friend's Mac since she has 10.15. I think the installer, once downloaded, needs to be opened once IIRC. I think there might be some problems though. Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/10.12 -applicationpath /Applications/Install\ macOS\ Sierra.app This might be old, but this is what I used for Terminal to create my Sierra Installer: Step 2: Once the download of macOS Monterey is finished, the installer will automatically launch. ![]() ![]() Can you post the How-To that you are using?Īlso, how are you formatting the Thumb Drive? Step 1: Launch the Mac App Store, and download macOS Monterey. ![]()
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