The bios wont show this as an option unless an actual USB 2.0 FAT32 Bootable device is installed BEFORE turning power on. A blank flash drive or improperly prepaired device wont work. You can make one with the Media Creation tool and 32 gig USB 2.0 flash drive.  Use the USB2 ports on the back underneath the Ethernet Port.  Use the media tool to erase a 32 gig max usb 2.0 fat32 flash drive.  Current windows version REQUIRES at LEAST 16 gigs but cannot be larger than 32 gigs. Media Tool 20H2 is Now 21H1 EXFAT and NTFS wont work. The update now button  [URL] The media tool works  [URL] Real devices are not expensive but the working units are often counterfeited.  I recommend buying them retail so you are sure you are not being cheated. Sandisk [URL] [URL] [URL]
Just got a new DELL PC and there is no boot from USB option. I've scoured this forum for previous solutions but they don't work for this. Did DELL finally disable all external drive booting? Is there no way around this? I'm using a flash drive install created with Windows 10 Media Creation Tool.I've posted some pics so you can see the settings I changed to try and allow USB booting. I also checked the "Enable USB Boot Support" box in the BIOS (not shown here) but no dice...[IMAGE][IMAGE][IMAGE]
Precision 3640 No USB Boot Option