![]() ![]() ![]() I see some conflicting information here about the date on the certificates from reading forum posts, so try to repeat and set date in terminal to 2015, 2018 (different posts suggest either). Restarting the target machine with option key i can choose the installer disk to boot, get to disk utilities, but the install OS X fails with 'download cannot be verified/validated'. On another machine (also el cap) i download OSX 10.11 installer dmg (from: How to get old versions of macOS – Apple Support (UK)), unpack, and use createinstallmedia on a USB drive as directed (here: How to create a bootable installer for macOS - Apple Support). hard drive is erased, no backup, no time machine. Macbook pro 17", around 2009/2010, was running El Capitan. ![]() Errors Using Bootable El Capitan Installer hi! looking for some help resurrecting an old macbook, and have been running in circles: ![]()
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