Some embedded systems have BIOS settings that allow you to disable internal SATA ports or M.2 slots. If these were accidentally disabled or reset to defaults, the boot path vanishes.
If you reach step 5 and the device still fails, the motherboard’s storage controller may be dead. At that point, it’s time to retire the hardware. But for most users, one of the fixes above will bring your system back to life. e gui boot failed reason nothing to boot path