Hacking Question about Wii U hacking

[Noctosphere]

I'm so confused with all those sticky, there are so many and so much informations are repeated in many of them. So I have few questions to ask and if you dont want to answer, then don't.
I don't want any " READ THE STICKIES YOU FUCKING NOOB" because I tryed but I'm very confused and there is no simple answer in those. I have a mental disease so don't ask me too much :S
So here are my question :
1-What is that MP4 exploit exactly? What does it do?
2-To load Wii U Isos, I need to use Loadiine, right? if there are any other homebrew that allow that, please list them.
3-What is the last version with a released exploit that allows to load Wii U isos? I think I got that some isos cannot be loaded due to loadiine needing some fix.
4-Those Wii U isos can be loaded in a HDD or only through the SD card? if it's the SD card, is there a limit size to it?

Thanks you all for your answer

 

[KiiWii]

1, its an exploit, crashes browser allows for custom redirection aka loading unsigned code.
2, no none. Only loadiine is available.
3, 5.5.1 is latest exploit.
4 HDD dont work for now, need elevated privilage than kernel, SD = 128gb for sure IIRC

 

[Noctosphere]

1, its an exploit, crashes browser allows for custom redirection aka loading unsigned code.
2, no none. Only loadiine is available.
3, 5.5.1 is latest exploit.
4 HDD dont work for now, need elevated privilage than kernel, SD = 128gb for sure IIRC

We can load Wii U isos with 5.5.1? really? YAY, thanks
So loadiine is compatible with 5.5.1, right?

 

[KiiWii]

Not isos exactly: WUD files (container like an iso) which need to be decrypted to folders for loadiine.

Yes all work with 5.5.1

 

[Noctosphere]

Not isos exactly: WUD files (container like an iso) which need to be decrypted to folders for loadiine.

Yes all work with 5.5.1

okay, thanks, I'll try to figure out how to hack my wii u now, thanks a lot

 

[KiiWii]

okay, thanks, I'll try to figure out how to hack my wii u now, thanks a lot

It's not hacking as much as running an exploit. It's not permanent.