How do I change the Boot Order for USB devices?
In BIOS, go to 'Boot Options' and move the USB device type you want above others in both UEFI and Legacy boot orders, making sure it's your first choice. For example, move 'USB Diskette on Key/USB Hard Disk or CD/DVD ROM Drive' up in the sequence (Page 7).
From the official HP 15 Db0000 Laptop PC manual, page 7
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