The 10.7.2 update was a major milestone, introducing and Find My Mac for the first time. Using a fixed 10.7.2 image ensures you are not dealing with obsolete installation media that halts halfway through the process. Why You Need a Fixed 10.7.2 Installer
If your current installer is giving you the "damaged" or "cannot be verified" error, it’s likely because of expired security certificates. Apple Releases OS X 10.7.2 - MacStories
: If you already have a DMG that won't mount, you can try repairing it via Terminal:
If nothing works, abandon the DMG you have. Find a friend with an old Mac running Lion or Mountain Lion, log into the Mac App Store with your Apple ID, and download a fresh copy of "Install Mac OS X Lion." The App Store will still serve the correct, unmodified file to a compatible OS. Then, use the "Show Package Contents" method above to extract a brand new InstallESD.dmg . This is, without a doubt, the most reliable way to get a working file.
: Newer hardware often has system dates that the old installer cannot recognize, requiring manual terminal commands to revert the date (e.g., to July 2011). Key Features of Version 10.7.2 mac os x lion 1072 dmg file fixed
Go to App Store → Purchases (if previously bought).
Boot your target Mac while holding down the key. Select your bootable USB drive from the boot menu.
Upon completion, the system will restart into the setup assistant. Troubleshooting: Common DMG File Issues
If your downloaded DMG file refuses to mount on a modern Mac running macOS Ventura, Sonoma, or Sequoia, you must bypass the modern DiskImageMounter framework. Convert the Image via Terminal The 10
For older software, you might need to temporarily loosen security restrictions. In , look for the "Allow apps downloaded from" section. You may need to set it to "Anywhere" (if available on your OS version) or click the "Open Anyway" button when the block occurs. You can also add the specific installer to the Developer Tools exceptions list in Privacy settings.
In Disk Utility, select your formatted USB partition, go to the tab, drag the InstallESD.dmg into the source field, and click Restore . Method B: Using TransMac (On a Windows PC)
He plugged the drive into the Mac Pro, held down the Option key, and heard that iconic, triumphant chime. The installer screen flickered to life—clean, grey, and beautiful. By dawn, the "Space" wallpaper of Lion filled his screen.
Resolved issues with Mission Control and desktop reordering. The "Damaged" DMG Issue: Why You Need a Fixed Version Apple Releases OS X 10
On the fourth night, fueled by cold coffee and desperation, he found a post on an archived hardware forum. The thread was titled: “For those with the 10.7.2 installer hang – THE FIX.”
If you manage to open the DMG, launch the installer, and receive an error saying the expired security certificate is the culprit. You can fix this by temporarily tricking your computer's clock.
Type the following command exactly as shown and press : date 0201010112 Use code with caution.
Type the following command: sudo xattr -cr /path/to/your/lion.dmg Press and type your Mac password.