How come some games are able to run without CFW?

Discussion in 'Wii U - Hacking & Backup Loaders' started by P_H_I, May 6, 2017.

  1. P_H_I
    OP

    P_H_I Advanced Member

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    Apr 23, 2017
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    Just thinking about something at the moment.

    So how come games such as SSB4 can be used without CFW, but others such as Mutant Mudds require it?

    I understand one is a disc release and one isn't, but is there something different with the files?
     
  2. BigPanda

    BigPanda Advanced Member

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    Jul 18, 2016
    Belgium
    To make it short and simple ...

    When you start a game, the console look for the license file (.tik) associated with the game inside your console. Those tickets are needed and included when you install game.

    Inside the ticket, you have the game it is associated with (TitleID) and if the game is linked to a specific console.


    For games shipped on disc, it is the same as eshop release with one exception. The .tik inside the disc is not linked to any console since it is impossible to know the console that will be used to play the disc you buy at the store.

    eShop game however are purchased from a WiiU/Account and are linked with the Account/Console it was purchased. If you try to run the game with your console specific ticket on another console, the game will refuse to run.

    Since eShop release and disc release are 'the same', it is possible to replace the console linked tik file with the one from a disc version that can run on any WiiU.

    So since the tik from disc are not linked to a console, everyone that install the eshop version with the tik from a disc version can run those without CFW.

    For eShop only releases, the reason you need a CFW is to ignore validity of the tik file, since, it is either 'fake signed/created' or linked to another console/account.

    Hope that answer your question.

    Also, it is not possible to remove the console specific information from an eshop release tik to have it run without a CFW, because that would break the tik signature (algorithm that check if the ticket is valid and unmodified) and it would refuse to run on a original firmware.
     
    Last edited by BigPanda, May 6, 2017
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