Disable UPnP on Scarlet's Sagem F@st3464 DSL bridge

Quickie:

telnet 192.168.1.1
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
login: admin
Password: ******** (OLOVDSL2)
[admin @ home]$ rg_conf_print upnp/enabled
(enabled(1))

Returned 0
[admin @ home]$ rg_conf_set upnp/enabled 0

Returned 0
[admin @ home]$ rg_conf_print upnp/enabled
(enabled(0))

Returned 0
[admin @ home]$ Connection closed by foreign host.

That's it.