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While installing Windows 7 I am not getting UEFI USB Hard Drive option in f9
@BS25, Welcome to HP Support Community!
This PC was shipped with win10, hence we don't recommend downgrading the OS to Windows 7, as Microsoft no longer supports it either, you may want to check with a local tech for further assistance on the same.
Refer to HP Notebook - 15-ac636tu Product Specifications document for details.
Hope this helps! Keep me posted.
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TEJ1602 I am an HP Employee
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