Okay, I just verified what y'all are saying. If I just copy the installer app to the flash drive and then option-boot, it does show up as a valid option, "Install Mac OS X", but when selected this fails with a generic error message, and reboots.
Only if I use the createinstallmedia command as per Apple's tech doc does it get far enough to bring up macOS Utilities, allowing me to install macOS. But... I couldn't get the High Sierra installer to work, regardless. I had to install Sierra instead. This is on an iMac12,2. Not sure what the issue is (firmware?), but HS won't install on it. I tried about 5 times. It gets almost to the end, and then pops up a generic error saying that macOS can't be installed on this machine, check your hardware, blah, blah. Now I'm worried that if I upgrade from Sierra to HS I'll get stuck in the same Catch-22. -Carl On Nov 13, 2017, at 5:19 AM, Neil Laubenthal wrote: > Actually… > > It depends on what you want your USB installer to do. If you want a bootable > USB installer then you need to use one of the applications that will make a > bootable one or use the technique available on the web to use the > makeinstallmedia command from terminal. If you just want to put the installer > itself on the USB drive, stick it into another Mac booted from it’s internal > drive and use the installer on the USB to do an in-place upgrade…that will > also work; doesn’t need to be a bootable USB for that. > > I’ve done it both ways over the years…albeit not with High Sierra. > > >> On Nov 11, 2017, at 11:06 PM, Carl Hoefs <[email protected]> >> wrote: >> >> >>> kay, I guess I was given bum advice. Somebody swore that he did it by just >>> copying the install macOS .app to an otherwise empty USB flash drive. That >>> approach seemed a little too easy, so I thought I’d ask. >> > > > ----------------------------------------------- > There are only three kinds of stress; your basic nuclear stress, cooking > stress, and A$$hole stress. The key to their relationship is Jello. > > neil > > >
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