![]() Surely there is just an ISO I can get and write without all these hoops?s I assume the real problem is a system incompatibility. When I google this error some results indicate it is due to an expired file, but changing my system date to 2016 does not fix it. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyUSBVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.appīut this yields /Applications/Install OS X El Capitan.app does not appear to be a valid OS installer application. dmg and then ran the terminal command from that support page: I used a utility to extract the Install OS X El Capitan.app file from the. ![]() DMG is downloadable directly from the Apple Support page, which provides instructions on how to make a bootable volume, with a major caveat On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg I am running into walls trying to make the stick from my own computer, which is an M1 MacBook Air running Big Sur.Īn El Capitan. ![]() It seems to me next step is to try a bootable USB stick. ![]() It won't boot past a spinning progress bar on a grey screen, and will not boot into Recovery Mode or Safe Mode. It is running Snow Leopard but the most recent OS it supports is El Capitan. I am trying to rescue my dad's 2008 iMac.
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