As long as eMMC is a standard component,reading and writing it shall not be that hard. (nearly the same as on 3DS)
But I read somewhere that eMMC got special boot spaces, so maybe won't be that easy...
If you succeed, when you'll get your eMMC back up what will you do with it ? It must be crypted and untill won't get the key you will do nothing with it.
But you will be able to downgrade if you update your Wii U.
Some peoples did the same with their PS3 and mess up with commands and erase their nands at first attempt instead of dumping it.
Others made an hardware mistake and burned their nand...
Good luck, but be careful !
I have dumped it once already but deleted it as I am doing a new approach I want to make sure the dumps match. Furthermore you should NOT let your operating system initiate the device, instead I use winhex to dump. I do not recommend any other method! It should also run under wine as well but if you are going to attempt this I recommend a Windows host to eliminate emulation or virtualization pass through issues which could cause incomplete dumps or even damage the flash if the software decides to take control of the device.
Beware Static
Static isn't so much an issue any longer to today's standards, when I worked at my IT job almost no one wore static resistance wrist bands and it has been tested by running motherboards against carpet. Either way not recommended and you should always keep it propped under neither a metal plate as I have done.
I have a 32GB WiiU that I wouldn't mind opening up. I have enough skills to solder a cygnos dual NAND chip into my slim Star Trek 360 (the solder points were originally meant for the phat 360's for those who don't know). That's not to mention the trial by fire repairs I have had to perform on the same 360 being it was one of my earlier projects.
Alright, would you by chance have a multimeter? If not that is alright, just be aware you should be using a fine tipped iron if you will be doing testing as this is not like the Xbox 360 (I'm from free60 IRC and have developed for the Xbox 360 in the past as well as publicized devkits so I know all about 360) you will be working with micro surface mount so you must be careful. I recommend the solderless solution I will be providing if you are willing to open your WIIU. You need some trace wire, Bare paint pen, an all in one card reader such as the targus which is $9.99 from target, and you will need some electrical tape. Bare paint pen can usually be picked up at your local hardware store i.e. Radioshack. Let me know when you are ready











