Yes but after installing extenal flash drive, somehow I found Apple SSD and Container disk 1. I thought of installing the OS high Sierra on one the aforementioned slots, but none of the slots appear when I’m about to download OS high Sierra. To be more precise, here are the pictures
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How shall I do it?
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I did like you said; install a flash key... well after doing that I clicked Show All Devices and I found internal storage:- Apple SSD and Container disk 1. So I thought of installing OS High Sierra on one of the slots but here’s what happened...