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.