Question uefi boot problem

Feb 17, 2019
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hello all
i just bought a new laptop dell inspiron 15 3000
and i want to install windows it already have windows 8 but i want to install 10
anyway i saw that to detect my flash drive i have to disable something in bios and enable something called legacy any way it all worked just fine and it detected my usb and i started installing it but it's not detecting my hard drive so please help