updated Sierra installer does not allow to create boot stick

Number:rdar://FB7677939 Date Originated:2020-04-27
Status:Open Resolved:
Product:macOS Product Version:10.12
Classification: Reproducible:
Since the signing certificates expired in 2019, a new version of the macOS 10.12 Sierra installer was posted for download at https://support.apple.com/HT208202 Within this version however, there is something broken, so that the 'createinstallmedia' tool cannot be used with it. It only gives the misleading error message '/Volumes/XYZ is not a valid volume mount point.'
From some reports of others I could find in the net, I can conclude that there seems to be a kind of validation going on on the supplied '--applicationpath' which fails as the new installer has a 'CFBundleShortVersionString' of '12.6.06' while the previous one had '12.6.03'.
Please fix this downloadable version, so that it is possible again to create an non-expired install boot stick of Sierra.


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