First boot after mainboard replacement

We couldn't detect an operating system or bootable drive.

Scan the QR code for setup guides or press any key to go to the boot manager screen for additional options.

BIOS showed the NVMe SSD.

Pressing F3 during boot opened the "Insyde File Explorer", which let me select the debian shim.efi file that booted grub.

Re-installing grub

Boot from the kernel with F3 by manually selecting the shim.efi, then run "update-grub2" to install the bootloader into the UEFI mainboard settings.

linux kernel boot issue

Falsche Shim-Signatur (bad shim signature)

• 6.16 did not boot, brought shim error
• 6.12.xx did boot

Reason: I had manually installed 6.16 to get Debian running on the laptop, see https://community.frame.work/t/tracking-debian-testing-on-the-framework-laptop/14448/34 This kernel had no signature.

This time I wanted to keep secure boot enabled.

Manually install Debian backports kernel

https://www.simplified.guide/debian/kernel-install-backports

$ apt install -t trixie-backports linux-image-amd64 linux-headers-amd64