Question: OS Recovery Chunk Validation Failed - Possible Fix!
I have been troubleshooting the OS Recovery chunk validation failure for 3 days now and just found the weirdest fix. This might not work for you due to firewall or proxy issues but the steps below resolved it for me. So please feel free to try.
Mac Mini OS X Server 10.8.2
1. Boot from an OS Recovery drive or thumb drive.
2. Run the OS X Installer.
3. Open the Log Window.
4. Click the Save icon in the log window while the installer is running. This will error out the installer and show your current log. You will get a pinwheel for a minute but it will go away once the log saves.
- if I don't do this step I will keep getting "Chunk validation failed, retrying..." and chunk data never downloads and keeps retrying.
5. Now if I run the OS X Installer again the validation failure never comes up and chunk data starts copying as normal.
I have tested this about 3 times and it works for me. What a strange bug!!!
Hopefully this will help someone!
Support all Mac machines, Mac OS X (10.5.7)