you will be fine using the forwarder for now... also do you have bootmii? and if your wii was made before mid 2008 do you have boot2? so you can make a backup of your nand.
ok did some research and looks like plenty of e sysmenu's have this channel on it and are fine..
when saved to computer rename ULNR.file to ULNR.wad
that is the newest version