Hi,
bad news: I have the same problem. Linkstation Duo (LS-WXL).
This is not just a problem with the firmware. I updated the firmware to 1.26 (I think) and now to 1.31. Problem is still there.
I also tried to change the configuration for phpMyAdmin (http://<mylinkstationIP>:81/phpMyAdmin/setup/) but the config folder is not writable for the webserver.
Next try was to use a old MySQL-Admin-GUI. But I got the error-message no login from a forign host is allowed.
It would be easy to solve if we have CLI-access via ssh. But the Linkstation kick me out everytime I tried to send a command. I tried "phpshell" on the webserver. But again the problem: no write access for the webserver
:-(