First boot after mainboard replacement
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 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.


linux kernel boot issue
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 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.