Not able to change path to /vl directory

[Flohack74]

Hi, I wanted to refurb the old bunny, and so far I could first sauccessfully flash the WPA2 firmware from https://github.com/RedoXyde/nabgcc/releases and was able to get it into my current home network.

Now I am trying to change the /vl URL to the hosted files on my server, but unfortunately whatever I do in the configuration page, the value stays the same, its simply not saved.

I know this worked before when I changed it from Violet to openjabnab URL, but now it seems stuck. Any ideas?