After upgrading to 6.10.0 the server stopped booting with the message "Unraid boot device not found" after the 30 second time out. Tried formatting the USB, and doing a fresh (didn't copy my config folder across) manual install of 6.10 but the issue was the same. Have manually installed 6.9.2, copied my old config folder across and am backup and running with out issue. So seems there is a bug\issue in 6.10.    I'm using a 16GB SanDisk Corp. Cruzer Fit as the boot USB dbunraid01-diag