Switch goes into DFU mode when you remove the eMMC module!

Discussion in 'Switch - Exploits, Custom Firmwares & Soft Mods' started by julialy, Mar 12, 2017.

  1. julialy
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    julialy Homebrewer

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    Switch goes into DFU mode when you remove the eMMC module!
    Plug the Switch into your computer!
    DFU = Device Firmware Update
    Let's talk about this newly discovered mode!
     
    Last edited by julialy, Mar 13, 2017
  2. pokemoner2500

    pokemoner2500 GBAtemp Advanced Fan

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    what's DFU mode?
     
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  3. linuxares

    linuxares GBAtemp Psycho!

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  4. Slowie89

    Slowie89 Newbie

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    DFU = Device Firmware Update
     
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  5. MaK11-12

    MaK11-12 GBAtemp Regular

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    With the eMMC module removed, would there not be anything for the DFU to write to though? Or maybe you can firmware upgrade by booting to DFU mode then plugging the eMMC module back in?
     
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  6. linuxares

    linuxares GBAtemp Psycho!

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    Possibily, depends on where the firmware itself is stored. There is a user on this forum trying to find out more about the Switch in this mode.
    However, I'm afraid they might have included e-fuses in the Switch so downgrading won't be an option through DFU mode. I hope I'm wrong.
     
  7. ehnoah

    ehnoah GBAtemp Advanced Fan

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  8. DeadlyFoez

    DeadlyFoez GBAtemp Guru

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    I used to hot swap nand chips in the wii.
     
  9. Jao Chu

    Jao Chu GBAtemp Advanced Maniac

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    straya m8
    Switch NAND access mod incoming?
     
  10. julialy
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    julialy Homebrewer

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    Maybe we can load our own softwares through USB... DFU code exec anybody? If the bootrom is read-only, this can't be fixed :-)
     
    Last edited by julialy, Mar 14, 2017
  11. rikumax25!

    rikumax25! Keyblade Wielder

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    you're going overboard
     
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  12. monkeyman4412

    monkeyman4412 GBAtemp Advanced Fan

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    This could be a huge access gate. Only if we could trigger it without removal on eMMC module
     
  13. Seelbreaker

    Seelbreaker GBAtemp Regular

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    Make a pcb where you can test which Data lane is needed to bei offline.

    If online one lane needs to Signal a "heartbeat" deactivate it and with some luck you habe acces to dfu mode while the nand is connected.

    Hw man in the middle
     
  14. Ranomez

    Ranomez Advanced Member

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    The actual name of it is APX mode and it is indeed a firmware update mode but is is considered to be more of an "emergency" firmware update mode like EDL (Emergency DownLoad mode) on Snapdragon SOC devices...
    Here's a bit of info on APX mode: https://forum.xda-developers.com/wiki/APX_mode
    And it most probably won't take anything unsigned and even if it does it will not boot cause of Secure Boot and ARM TrustZones.
    That being said we don't yet have the tools to communicate with the APX mode yet and some Tegra SOC devices (HTC One X/One X+) never got working ones.
    And again as I have said on the other thread: APX mode can be really dangerous if it was implemented wrong/if it is used wrong so you people just be careful what you do to avoid ending up with an expensive paperweight.
     
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  15. jupitteer

    jupitteer idk what i'm doing

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    It is literally called a bootrom. ROM=read only memory
     
  16. PhyChris

    PhyChris GBAtemp Regular

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    just cut power to the eMMC chip. a 'switch' could be used to restore power after DFU mode.
     
  17. DeadlyFoez

    DeadlyFoez GBAtemp Guru

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    Many times rom, just like firmware, only really means now that the end user isn't supposed to be able to change it. There tends to be very few things that are truly read only.
     
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  18. Alkéryn

    Alkéryn Moon Dweller ~

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    Albategnius, Moon
    ROM is often rewritable
    it is called rom but most of the time it isn't
     
  19. jupitteer

    jupitteer idk what i'm doing

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    No, it's not. If it is rewritable, it is not rom.
     
  20. endoverend

    endoverend AKA zooksman

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    Relax. It's not going to load anything unsigned without significant low-level modification.
     
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