Maybe a stupid question but did you flag the usb as bootable ?
If yes, is your old iMac EFI compatible ? If no, you should get a look at woeUSB-ng. It supports legacy booting.
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If yes, is your old iMac EFI compatible ? If no, you should get a look at woeUSB-ng. It supports legacy booting.
No stupid question at all!
To make the USB bootable, is it about choosing « GUID Partition Map » as the Scheme? Or something else?
On the Mac side, I have no other USB to test it out, but I will look into this woeUSB-ng, never heard of it!
Thanks