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We have a machine with an Asus P7P55D-E LX motherboard. We're trying to set the default boot device to a USB attached flash drive.
We set up "Removable" as the first and only boot device in the BIOS Boot options, but it refuses to boot, UNLESS we press F8 at POST and manually select the USB option.
1We tried that, but still the only options in "Boot Devices" are "Removable, SATA, CDROM, Disabled" ... and "Removable" still won't boot from USB. Tried a different USB port, but didn't help. – Dan – 2012-08-22T16:33:50.947
We had to change USB mode to "Legacy" in the Advanced menu. Now it's working! – Dan – 2012-08-22T16:42:12.633
1+1: The restart between the two steps IS crucial (even if you have the USB listed in the boot priority list... might be from a different emulation setup...) – masu – 2014-01-23T17:36:25.087