Bc signals the loading module so you can get the gamecube backup launcher .2 into the disc channel. So yeah, if you want it you can. If not, just use the backup loader and you just need an MIOS.
thats what i did... i think. i used MIOS patcher to install cMIOS v8 and I pressed X on the gamecube controller to get the backup loader but the disk cant be read.