Costa

Thanks all for the very useful thread. It helped me a lot, so I want to add my 50c. I have the f6 424 max, with the i5 cpu. In my case, the problem was the BIOS battery, that tiny CR2032 coin cell. Without the battery, BIOS changes would not persist. The sign was the BIOS time and date not holding. When you reboot, BIOS goes back to factory and looks at the internal USB stick first. So it seems to me that the workaround fix the boot by pointing the default boot option to the preferred one, as the BIOS boot order choices would not stick on reboot. New battery added and internal USB removed. BIOS date time is holding and NVMe is booting fine, proxmox in my case.