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We are experiencing a boot issue on two HP Elite Tower 600 G9 NVME machines with the same configuration and BIOS version U01 Ver.02.13.03. After installing a Debian-based operating system on the NVMe drive, the system fails to automatically detect the boot device, displaying the error:

"Boot device not found. Please install an operating system on your hard disk."

 

However, if we manually select "Boot from file" from the boot menu and navigate to the GRUB EFI file, the system successfully boots into the OS.

 

We have verified that the EFI partition and bootloader files are correctly installed and configured, but the system does not automatically boot from the NVMe drive. Additionally, there is no custom boot option available in this machine, which limits our ability to configure the boot order manually.

 

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