Article 6NWR7 Issue on my HP 600 G4 SFF: no boot of previous double boot Win11 / Debian 11; few advices welcome

Issue on my HP 600 G4 SFF: no boot of previous double boot Win11 / Debian 11; few advices welcome

by
floppy_stuttgart
from LinuxQuestions.org on (#6NWR7)
Hello,
I was updating the firmware of the HP desktop under Windows11 (as per usual recommendations from MS), then shut down the PC, went away for 1 week, then hen trying to boot again, it dont start:
- BIOS updated to latest version
- Linux HDD 500GB where the Debian11 OS and most important data are, dont boot.. or it say no OS detected when I try to start the PC
- windows11 dont boot on the separate MS SSD
First: no panic, the desktop start a lubuntu live USB (the debian live did not start due to the AMD graphic card in it) and all data of the HDD can be seen = no data loss so far

Now, I would like to find a solution for making it working again in any way:

- could we have an UEFI setup which messed up during the BIOS update? (reason why the OS on the HDD is nomore recognized). So now, how to update the UEFI (new version?) on the HDD for the BIOS to (perhaps) start the Linux on the HDD again? with linux tools (since I cannot start windows11, I cannot make anything with it).. perhaps the use of rEFInd could help?

- an overcurrent during the one no-use week could have destroyed the SSD? (the SSD drive is NOT seen by the Lubuntu live which is weird; except the Lubuntu live cannot see Windows partitions). Any hint why this happens is welcome.

I am further searching a solution in the net..
- Windows11 and UEFI seems to be dramatic together..
- Lubuntu should see the windows partitions.. or not..
- till now, I was happy approx 3 years with my double Win/Linux boot. Snif.

Comments/remarks are welcome.
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