Debian 12 bricked (won't boot). How to unbrick it?

How the brick happened:

  1. I have a SSD with a recently-installed UEFI Debian 12 (Kingston SA400S37120G). It was working just perfect; until
  2. I swapped temporarily the SSD by a HDD with Debian 11;
  3. When I swapped the SSD back, the Debian 12 is nowhere to be found on the motherboard Boot Settings (Asus Crosshair V Formula-Z). I get only a cursor when trying to boot again, or nothing, depending on the settings I choose. But no Debian 12 at all.

Why I can’t unbrick:

  1. When my Debian 11 bricked (most commonly on similar circumstances, like swapping by a Windows HDD), I quickly fixed it every time using a Rescatux thumb drive.
  2. However, Rescatux won’t work with my new graphics card (Nvidia Geforce GTX 1650).
  3. Therefore, I don’t have the easy Rescatux unbricking path at hand anymore, and don’t know what to do without it.

Question:

  1. Which information is needed to understand what happened, and how to get it?
  2. What can I do in order to unbrick my Debian 12 install?

Additional information:
Boot Info Summary @ Paste.Debian

Boot-Repair is for Linux systems. It really just updates grub or offers to reinstall grub or a few other settings. Will not fix Windows issues, unless the update to grub finds a Windows entry. Must be sure to boot in same boot mode as install. Most systems now are UEFI boot.

Please copy & paste the pastebin link to the BootInfo summary report ( do not post report), do not run the auto fix till reviewed. Use often updated ppa version with your USB installer or any working install over somewhat older ISO.

https://help.ubuntu.com/community/Boot-Repair
https://sourceforge.net/p/boot-repair/home/Home/

Very occasionally the default fix may not be best choice & then advanced mode required. Best then that someone knowledgeable on boot issues reviews report to confirm best fix.

If just UEFI boot entry missing, then the install of grub installs a new UEFI boot entry using efibootmgr. You can do that yourself. See:

man efibootmgr

https://askubuntu.com/questions/668506/changed-the-uefi-motherboard-on-a-dell-laptop-now-it-says-no-os-detected

Answered By: oldfred
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