I just purchased a Wii U yesterday and after the initial setup I wanted to transfer my Wii data to my Wii U. I had to do some preparation for the transfer because I have a hacked Wii. I hadn't used it in a year in a half so I hadn't updated the system at all. My Wii was on System 4.1u, and in order to get the Wii Transfer Tool I had to have 4.3u and the Shopping Channel v21.
After too many hours of research I finally figured out that I should be using DOP-Mii to install updates to the system. Before I did anything I did a NAND backup using Boot-Mii. I then went into DOP-Mii and installed IOS80, and IOS62 and then I updated the system to 4.3u. For some reason I was not able to get into the Shop Channel; when I hit Start it would act like it is loading and then go right back to the Wii Menu. I restarted the Wii to see if that would help and the same thing happened. As a last ditch effort I went into DOP-mii and when through and installed any IOSs that were not installed and not required for Korea, restarted the Wii and it let me in. Great I though, now I can get all of my data transferred.
I had an SD card that I had formatted FAT32 and worked in my computer. Loaded it into the Wii U and let it do it's thing, both machines were online btw. When the Wii U was done preparing the SD card I ejected it, and inserted it into the Wii. The data transfer was successful to the SD card from the Wii. I then ejected the card and put it back into the Wii U and went to finish the process of transferring the data to the Wii U, or so I thought. I was on the screen that says Loading Data from SD Card... and a warning to not turn the power off or take the card out or you will lose data. An hour went by and then two hours went by; I left it on overnight night and it was still on this screen. I did turn my Wii off after the first hour, which both machines were supposed to be on, but from what I have read the transfer shouldn't take an hour.
I am at a loss as to what I should do now. Will I really lose the stuff that is on the SD card if I turn the power off? Can I just turn the Gamepad on and get back to the Wii U menu and start the import again?
If I do lose the data here is my other dilemma. I did a NAND back up of the 4.1u system before updating to 4.3u, but in the hustle of trying to do this I was also attempting to be a decent parent and wrangle the kids for bed and such with my wife and forgot to do a NAND backup up the 4.3u system before I did the transfer which wipes the data from the Wii. Will I be able to restore the 4.1u NAND backup to a system that has been upgraded to 4.3 so I can start over? If not will I be able to extract all of the save data, Miis and anything else from the .bin file?