"Don't have to rename it, just put the dol on the root, install it, then load installed file. Then get the HBC installed again, follow xzxero's update to 4.2 section to fix your Wii up to something sane again, and then follow the rest of his guide, and don't let your friend touch your Wii again."
So basically you just did everything I said not to do and fucked it up even more. Nice.
Can you still not run the hackmii installer from bannerbomb? (remember to use V2 of bannerbomb and click the SD card menu icon on the system menu to load it instead since you're on 4.2 now.) If you can't run wad manager or dop-IOS or the hackmii installer or anything through bannerbomb, I would just give it to your friend and tell him to fix what he fucked up or pay for it. And if he does happen to get a new one for you, tell him to stay the fuck away from it.
So basically you just did everything I said not to do and fucked it up even more. Nice.
Can you still not run the hackmii installer from bannerbomb? (remember to use V2 of bannerbomb and click the SD card menu icon on the system menu to load it instead since you're on 4.2 now.) If you can't run wad manager or dop-IOS or the hackmii installer or anything through bannerbomb, I would just give it to your friend and tell him to fix what he fucked up or pay for it. And if he does happen to get a new one for you, tell him to stay the fuck away from it.