ORBI RBK753 - LAN settings “400 Bad Request”

[MaleHumanUK]

I have Orbi RBK753, on firmware v3.2.17.12

When I try to apply settings to ‘LAN Setup’, under ‘Advanced - Setup - LAN Setup’, it returns “400 Bad Request - This server does not support the operation requested by the client”.

I have tried a factory reset, and tried multiple browsers.

Any ideas?

[FURRYe38]

What settings are you configuring in LAN Setup before you select the Apply button?