Hello everyone,
Thank you for your answers.
Unfortunately nothing works, the SD card was corrupted/dead.
I tried :
- create an image from SD card with Win32DiskImager > failed (unable to read card)
- mount partitions to Ubuntu > failed (I/O errors)
So, the good news it that a part of pictures was copied to our business storage environnement ! So it's a small damage !
Tomorrow morning I'll make a backup of LE with his backup tool !!
Best regards !
David