Damn this brick story sure scares me.
Fun fact: I was really lucky last night when I used my WiiU as a guineapig. I basically had haxchi 2.2 installed already over phantom hourglass, went ahead and tested CHBC before Fix released it. Everything went smoothly, but the wiiu did not reboot. So after it remained stuck in a whitescreen, (forgot to remive my usb before installing, so that may be the reason it happened) I hardrebooted my console. Luckily for me, the coldboothax was properly applied, while haxchi did not overwrite my rom.zip. thanks to the already installed setup, my WiiU was simply autobooting to HBL. If it wasn't from that, I would have been stuck in a bootloop with a ds game launching everytime automatically
That was scary, I tell you