@bof007, in my case (QGD-1600P) I hit F7 during boot to bring up menu, then I change the order of boot devices, save and exit. This will get the server to boot from the flash drive as long as it is present, if I remove the flash and reboot the menu will reset to DOM (or whatever as I have not found a DOM yet) QNAP OS boot as 1st boot device.