Password Reset
If you have forgotten your password, click the “Reset Password” button above. OECM will send instructions to the indicated email address.
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hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur Use code with caution. 3. Write the Installer Files to the Image
Use Apple's built-in createinstallmedia tool inside the downloaded app to write the installer files into the mounted volume. This step requires administrative privileges.
If you are encountering specific errors while creating the installer file or need help using it, please let me know: macos big sur 1121 installer dmg
– If installing on a newer Mac (released after 2021), the installer will likely lack required firmware. Use the original macOS version that shipped with the Mac instead.
Use the createinstallmedia tool embedded inside Apple's official App bundle to flash the Big Sur setup files onto the mounted volume. You will need to enter your Mac's administrator password. hdiutil attach /tmp/BigSur
: Easily set up macOS Big Sur in virtualization environments like VMware, VirtualBox, or Parallels Desktop.
Built to run natively on the then-new Apple Silicon (M1) chips while maintaining compatibility for Intel Macs. How to Download the Official Installer This step requires administrative privileges
Double-click the downloaded .pkg file. Run the guided installer wizard to extract the native Install macOS Big Sur.app into your folder. Converting the Installer App into a DMG File
(Double-click it). Inside, you will find the .app . Drag it to /Applications .
Look for version 11.2.1 . If available in the current catalog stream, download it by executing:
Register to access your dashboard, agreement documents, and information session recordings – and easily track expirations, retenders, and required transitions.
Register as a CustomerRegister to view your agreement data, track reporting deadlines and performance, and securely submit Spend/KPI reports and CSAs.
Register as Awarded SupplierIf you have forgotten your password, click the “Reset Password” button above. OECM will send instructions to the indicated email address.
Don’t yet have an OECM user account?
Register as a Customer or Register as Awarded Supplier