I'm trying to get my board to boot from a USB stick that contains recovery media for Macrium Reflect backup (I'm testing the recovery media). Hitting F8 at the ASUS logo takes me to the boot device selection screen, but the USB stick is not listed. I have tried it with the USB stick in two different USB ports, but it made no difference. It's a USB 2.0 stick and I tried it in two different USB 2.0 ports. Below is a screen cap. Can anyone help? Thanks.
ASUS ROG Strix Z390-E | Intel i7-8700K | Corsair Vengeance LPX 32 GB DDR4-2666 | EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT | Samsung 960 EVO 500 GB M.2-2280 SSD | Western Digital Black 6TB | Cryorig H7 | Fractal Design Define R6 Gunmetal TG ATX | SeaSonic FOCUS Plus Gold 650 W 80+ | Windows 10 Pro 64-bit