I tested the rut955 yesterday.
The config is ok and wasn't wipe. The router doesn't route default to the mobile net. Firewall doesn't work (doesn't work how I expected).
I've started with factory defaults, but the same problem (tested with "basic admin interface" and with all features and ssh login):
No default route to mobile (connected, but no route, no traffic - german telekom D1), no nat / masquerading. The rut955 itself can't connect to the mobile net. I try "route add default gw mobileinterface and iptables --flush" and the router stopped working (don't know: but no connections (all interfaces) i have to reboot).... feature or bug?
I think the 7 version is early beta, with many (!) bugs.
I flashed the old 6 version and all work (ok sms with special character doesn't work :-) )
Sorry, but I can't do more - I don't have the time for beta-testing ...