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Dell Optiplex 9020: unable to install High Sierra


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If you used a bootpack labelled "Optiplex9020_A20", it was meant for a model running BIOS A20 or above. Start by updating your BIOS to the latest version.


If you want further assistance, you'll have to post your system's specs and a zipped copy of the pack you used or a link to it since it existing stuff.

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