I just solved inserting routing rules in RUT950 via CLI.
echo 200 reth0 >> /etc/iproute2/rt_tables
echo 201 reth1 >> /etc/iproute2/rt_tables
ip rule add from 10.107.134.176 table reth0
ip route add default via 10.107.134.177 dev wwan0 table reth0
ip rule add from 192.168.43.254 table reth1
ip route add default via 192.168.43.1 dev br-lan table reth1