Why can't we use save editors to make entrypoints?

Discussion in '3DS - Homebrew Development and Emulators' started by mrissaoussama, Sep 10, 2016.

  1. mrissaoussama
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    mrissaoussama Hiuhbi32

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    Nov 23, 2015
    Why isn't it possible to edit a save file to launch the homebrew launcher?
     
  2. Filo97

    Filo97 Zelda's totally my sister! Not lying!

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    Hyrule Castle
    maybe cause the GAME is on the ROM (Read-only-memory) and as such we can only use saves to share entrypoints found in the ROM
     
    GilgameshArcher likes this.
  3. ihaveamac

    ihaveamac GBAtemp Guru

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    Tigard, OR
    because you also need to find an exploit in said game.
     
    GilgameshArcher likes this.
  4. LinkSoraZelda

    LinkSoraZelda GBAtemp Advanced Maniac

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    Land of the Rising Orange
    This is what Ocarina of Time hax is.
     
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  5. RupeeClock

    RupeeClock Colors 3D Snivy!

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    May 15, 2008
    If you're talking about editing a save game, that depends.
    If you want to run an exploit from a digital title, easier said than done due to how you need to first decrypt the save before you can modify it, and then encrypt it. This process requires an entrypoint all its own.
    If you want to run an exploit from a game cartridge, this is easier to do because there's no console-specific save encryption to worry about, but you need some sort of tool to load the exploited game save onto the cartridge like a save dongle or another exploited system.
     
  6. mrissaoussama
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    mrissaoussama Hiuhbi32

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    Nov 23, 2015
    We can't do that using a save manager app?
     
  7. RupeeClock

    RupeeClock Colors 3D Snivy!

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    Like JK's Save Manager? Yes, but once you're there you've already got an entry point.
     
  8. mrissaoussama
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    mrissaoussama Hiuhbi32

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    Nov 23, 2015
    What if i want to turn a random 3ds game cart into an entry point to use with other 3ds consoles?
     
  9. ihaveamac

    ihaveamac GBAtemp Guru

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    Tigard, OR
    find an exploit in the game first. easier said than done.
     
  10. Hiccup

    Hiccup GBAtemp Advanced Fan

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    Nov 21, 2009
    @first post
    this is possible and has been done. read up on your 3ds exploits! :P
     
    Xiphiidae likes this.
  11. GilgameshArcher

    GilgameshArcher GBAtemp Advanced Fan

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    U can get a ROM, edit the ROM to creat a custom entry point, then build a CTR game card with that ROM, but this is quite expensive and needs a lots of hardware, software and knowledge.
     
  12. 0x40

    0x40 GBAtemp Regular

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    Apr 20, 2013
    Bullshit. The ROM would just fail the signature check if it was modified.
     
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  13. xerosagas

    xerosagas Advanced Member

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    Feb 9, 2015
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    I use my Sky3DS exclusively for this purpose.
     
  14. Mazamin

    Mazamin GBAtemp Advanced Maniac

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    You need to find an exploit in the game. Reverse the save checksum, otherwise any edit would make the save corrupt. Check for vulnerabilities, such as buffer overflow etc. Check if the vulnerability can be exploited, if yes you can load custom code with it. Create a payload, a rop and you're done. If that's out of your knowledge then you can't do it.
     
    Hiccup likes this.
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