Have you updated the EC by referring to the documentation?When booting press DEL repeatedly until the BIOS shows up. Go to SECURITY and set SECURE BOOT CONTROL to DISABLED. Goto EXIT and select EXIT SAVING CHANGES. When the reboot starts, hit F7 repeatedly until the boot menue appears, now select BOOT FROM USB, this should work now (did it for me).
Still no idea how to set AUTO POWER ON. Can somebody point me to the right submenue in the BIOS please?