Updated the linkstation anyway with the firmware 1.65. Fortunately, I was able to guess the right password to get ssh access. The samba server on the linkstation is configured to not activate the unix extensions of the samba software. If you change the configuration and restart the server, it will delete the setting. Solution: edit /usr/local/sbin/nas_configgen. Search for „extensions“ and replace „unix extensions = no“ by „unix extensions=yes“ (make sure to use the space so the string bounds stay the same). The unix extensions will preserve the file owner and group and the file modes, which is considerably better than mounting with a fixed set that supersedes the access rights.