These commands are not necessary to manually input for firmware 4.5:
uci set firewall.wan_in_conn_mark=rule
...
uci set firewall.wan_in_conn_mark.set_xmark='0x80000/0x80000'
...
To revert that:
sh /rom/etc/uci-defaults/99-vpnpolicy
uci commit
/etc/init.d/firewall reload
See if it fixes your issue.