I have a RUTX08 router that I'm trying to set up as a client to connect to a WireGuard VPN server (Mullvad).
The device arrived with a very old firmware that I successfully upgraded to the latest one: RUTX_R_00.07.02.7
(Worth noting that I could only update it by uploading the firmware file as it wouldn't download it directly from the server and after the update I had to factory reset the router because it wouldn't let me log in: forever spinning wheel, even after multiple reboots. Anyway, now it's online again.)
I opened Services / VPN / WireGuard, entered a name in the "New configuration name" field and clicked "Add".
A popup appears with the details, the section "WireGuard interface" is filled, but there are no fields where I could enter any Endpoint or DNS or interface address.
What am I missing?