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I have tried to make bootable USB for installing MacOS El Capitan and Sierra on my MacBook Pro 2011.
First time it worked.
When I tried to make another one it keeps giving me error that mount point is not correct.
when I try to drag drop the volume to avoid any mistakes in spelling it add number "2" besides the volume name and again gives the same error.
Hope you could help me with the mistake I made.
Thank you.
MacBook Pro 13″, macOS 10.12
I take it you managed to create the bootable installer for El Capitan without difficulty,
and the problem is with making a bootable installer for macOS Sierra.
When Apple recertified their installers in October 2019 they made an error with the Sierra installer,
Apple have done nothing to rectify this even though they have been informed of this many, many times.
The error you see while trying to make a bootable install,
"Volumes/<MyVolume> is not a valid mount point, is down to a simple one character typo in the info.plist.
There is however a workaround.
With Install macOS Sierra.app in your Applications folder open Terminal.
Paste in this command
sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist
press return
enter your password
press return
now paste in the createinstallmedia command for Sierra where MyVolume can be replaced with the name of your USB stick
If your USB name has more than one word separated by spaces you would need to type it in as
/The\ USB\ Name
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app
press return
follow the prompts
I take it you managed to create the bootable installer for El Capitan without difficulty,
and the problem is with making a bootable installer for macOS Sierra.
When Apple recertified their installers in October 2019 they made an error with the Sierra installer,
Apple have done nothing to rectify this even though they have been informed of this many, many times.
The error you see while trying to make a bootable install,
"Volumes/<MyVolume> is not a valid mount point, is down to a simple one character typo in the info.plist.
There is however a workaround.
With Install macOS Sierra.app in your Applications folder open Terminal.
Paste in this command
sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist
press return
enter your password
press return
now paste in the createinstallmedia command for Sierra where MyVolume can be replaced with the name of your USB stick
If your USB name has more than one word separated by spaces you would need to type it in as
/The\ USB\ Name
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app
press return
follow the prompts
Thank you. It worked fine
Create install media