Version 5.3.1 U, available via an Internet connection, includes the following improvements:
Mario Kart 8 highlight reel upload fix:

• Resolved an issue that resulted in some users receiving error code 104-1852 while uploading a Mario Kart 8 highlight reel to YouTube

Improvements to system stability and usability:

• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience

Source

I just updated (5.3.1E) and tested my vWii, USB loading, Nintendont and Homebrew all seem to be in order. I haven't tested in depth but it doesn't break anything obvious that I can see.

 

Pretty much, it's their own euphemism of saying "we patched your haxxors trololololol" XD

 

Pfft, it's a lot more stable than in 2012, but, the so-called "stability" is their way of saying they patched exploitable bugs.

 

I would assume the "i smash your wii" Memory Bug hasn't been fixed?

 

not yet (great name too lol) they are working on a fix though

 

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Oh, well, okay then. So, uh, what if they release a patch for SSB?

 

Ah, but if you had to send it in or update via a patch for the game, one is pretty much screwed as Nintendo would just update it to 5.3.x. I don't like this at all. I haven't had that error before, and I sure as hell hope I don't get it. Otherwise, I pay 100 dollars for repair and get back a force-updated console from Nintendo. Ugh... How do I know I'm not one of the "lucky" ones with this problem? Oh and it's a 8 GB model from 2012, so, now I'm actually afraid to turn it on or play SSB. Maybe I should just sell all my games to avoid this. Hell, maybe I should just sell the Wii U as I might have a defect. Ah crap.

 

Never heard of this before, yet dont use the wiiu for anything except ZombiU and Vwii softmod for GC isos as im still on 4.03. What is actually triggering this error? Semi brick or full brick?

 

Almost certainly 5.3.0, but unsure about 5.3.1 since the number of bugs we have is going down steadily. It may end up like the 3DS where we only have access to a certain range of firmwares, unless we do it ourselves and find a new bug to exploit that nobody has found before. Of course that'd require a lot more manpower/more skilled people at finding exploits to do so.
EDIT: So it's time to call in anyone and everyone you know who can research exploits, tell them to download the latest version from Nintendo Browser (http://www.nintendo.co.jp/support/oss/index.html#oss_wiiu) and start looking.

 

Again, it only affects a very small no. of Wii U consoles, just like how some Wii consoles couldn't read dual-layer discs, same kind of situation. Stay on 5.2.0 to be safe, that's what I'm doing. Another theory is people are closing the game down when it auto-saves. If people do get the error, do NOT go into Data Management.