Macos Big Sur Iso 2021 May 2026

Alternatively, if you have a legitimate copy from 2021:

hdiutil detach /Volumes/Install\ macOS\ Big\ Sur hdiutil convert ~/Desktop/BigSur2021.dmg -format UDTO -o ~/Desktop/BigSur2021.iso Rename the resulting .cdr file to .iso . macos big sur iso 2021

Published: Retrospective Look (Updated for 2025 Users) Alternatively, if you have a legitimate copy from