I had the same problem with the quad-force at first, Wiiflow would lose the GC icon logo when it was installed, and the RVL BCv6.wad would make my Wii power off as soon as I tried to play either Mario game.
I fixed mine with DML booter (not loader sorry) with the Quadforce.wad installed on my real nand, another person I know managed to fixed the problem with the RVL BCv6.wad installed on there real nand and DML booter via homebrew channel (not a forwarder)
I fixed mine with DML booter (not loader sorry) with the Quadforce.wad installed on my real nand, another person I know managed to fixed the problem with the RVL BCv6.wad installed on there real nand and DML booter via homebrew channel (not a forwarder)