Question: Making a Bootable El Capitan, with macOS HS
I need to install OS X 10.11 in order to update the firmware on my camera.
I am currently running macOS High Sierra. I downloaded the “Install OS X El Capitan” from the App Store.
Following the Apple Support Document (https://support.apple.com/en-ca/HT201372) dated Oct 26, 2017, I followed the directions using terminal to create a SD Card “Install OS X El Capitan”.
However, when I booted from the SD card, it says the card is not GUID partitioned. Disk utility is not providing an option to change the partition to GUID scheme on the SD card.
MacBook Air, macOS High Sierra (10.13), i5 4 GB Ram (early 2015)