minesheep, thank you for trying to help me. "Have you tried to mount it with "Use backup header embedded in volume if available"?" Yes, but it doesn't work. "If you can mount hidden one that way but not the outer one it may be that not only the header is corrupt but also the filesystem data. If that is the case most of the data should still be recoverable." in the usual way, I could not mount any of the volumes. But I managed to mount the volume from a sector-by-sector copy of the SSD. Thus, managed...
Can't mount encrypted volume on the SSD