Thx but I finally got it working with another SD card I had lying around then reformatted the card I intended to use for the Rednand guide. The only thing is that the Rednand install is taking way longer than it should beSounds like a formatting issue. You've successfully written the boot info to the motherboard (hence your purple light), but the Wii U fails to load the exploit from the SD Card.
If you haven't already, follow the install guide very carefully if you plan to reinstall. There's also a guide specifically for this situation, where you get error 160-0103, here.