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‎08-31-2020 11:12 PM

HP Recommended
Product: Pavilion 15 Notebook
Operating System: Microsoft Windows 8.1 (64-bit)

I am trying to restore an  HP Pavilion 15 Notebook(2014 vintage) which was running Windows 8.1 before a disk head crash, which required me to replace the internal HDD. When I try to re-install Windows from a set of 3 Windows 8 recovery media using an external DVD/CD drive (the internal one having died long ago) I do not see an option in Boot Manager to boot from a USB CD/DVD ROM even though I have changed the UEFI Boot order to have the USB CD/DVD ROM Drive option at the head of the list, and CD-ROM Boot is enabled in the Boot Options screen of BIOS (or rather InsydeH20 Setup Utility). The  only options are OS Boot Manager and Boot from EFI File. There is a legacy boot order which has the USB CD/DVD ROM drive at the end of the list but this is greyed out. How can I get the machine to boot from an external USB CD/DVD ROM drive?

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