Sorry for my english but i'm french lol
I give you a solution to install wad on its emulated nand:
-Take a usb key and format it to FAT32
-Put in the decrypter nand
-The plug on port 0 (the left,) wii has you
-Launch WadManager 1.5
-Select the ios249
-For the nand device take: USB 2.0 Storage...