Quit Terminal and immediately resume the installation wizard. The validation check will now pass. Step 3: Extracting and Repairing the DMG File
If your installation fails, it is likely due to one of these issues: mac os x lion 1072 dmg file fixed
Select your USB flash drive from the left sidebar (choose the root drive, not the volume underneath). Click the button at the top. Configure the options exactly as follows: Name: LionInstaller Format: Mac OS Extended (Journaled) Scheme: GUID Partition Map Click Erase and wait for the process to finish. Step 2: Extract the BaseSystem.dmg Quit Terminal and immediately resume the installation wizard
: Standard Internet Recovery for Lion is currently unreliable or broken as Apple’s servers no longer support the original verification methods. Time Discrepancies Click the button at the top
Open your web browser and navigate to the official Apple Support Downloads archive.
After applying the fixes (quarantine removal, date reset, etc.), the DMG should mount like a standard disk drive on your desktop. You should be able to open the volume without error messages and see the "Install Mac OS X Lion" application icon. This indicates the DMG is successfully fixed and ready to use.