VBoxManage modifyvm "BigSur2021" --cpu-profile "Intel Core i7-6700K" VBoxManage setextradata "BigSur2021" "VBoxInternal2/EfiGraphicsResolution" "1920x1080" VBoxManage modifyvm "BigSur2021" --nested-hw-virt on Boot the ISO. If you see a Guru Meditation error, your 2021 ISO is the only version that supports the -cpu-profile fallback. Because you are using a specific 2021 build, you might encounter these issues:
Do not risk your system’s security by downloading a random ISO. Take one hour to follow Part 3 of this guide. Create your own ISO using Apple’s genuine 2021 installer payload. Store that ISO on an external SSD. You will thank yourself in 2026 when you need to roll back a failed macOS update.
A: No. Dual booting macOS on standard PC hardware (Hackintosh) requires OpenCore, not a raw ISO. You would extract the .app from the ISO and use OpenCore’s installer. macos big sur iso 2021
Alternatively, if you have a legitimate copy from 2021:
Stay safe, and enjoy the legacy of Big Sur. Take one hour to follow Part 3 of this guide
A: You have downloaded a fake. A real macOS Big Sur ISO is 12GB to 14GB . Delete it immediately.
But why “2021”? macOS Big Sur was originally released in November 2020. The 2021 versions (specifically 11.2, 11.3, and 11.4) contained critical stability fixes, better M1 emulation support, and security patches that the initial 2020 launch lacked. You will thank yourself in 2026 when you
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 .