downgrading firmware & efuses

Discussion in 'Switch - Console, Accessories & Hardware' started by eddo12321, Feb 3, 2018.

  1. eddo12321
    OP

    eddo12321 Newbie

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    1
    Feb 3, 2018
    United Kingdom
    this is half homebrew and half hardware so idk really where to put this
    anyway, nintendo made efuses to stop downgrading, but cant you just get a custom firmware that says its the latest and install that? or does that break some fancy signature thing?
     
  2. Yepi69

    Yepi69 Jill-sandwiched

    Member
    7
    Nov 29, 2010
    Portugal
    Behind you
    Spoofing and actually being the correct system version is different.
    There needs to be an exploit that allows the system to completely skip the eFuse checking part, there's no way to downgrade without skipping eFuse check.
     
  3. kprovost7314

    kprovost7314 GBAtemp's Official Bara Master

    Member
    6
    Dec 24, 2014
    United States
    In that bara manga ( ͡° ͜ʖ ͡°)
    Would that require a kernel, or full on TrustZone exploit?
     
  4. Loko4

    Loko4 GBAtemp Regular

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    2
    Nov 19, 2011
    Brazil
    If you already have a custom firmware theres is no point of downgrade.
     
  5. Yepi69

    Yepi69 Jill-sandwiched

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    Nov 29, 2010
    Portugal
    Behind you
    Since its mostly a cold boot process, full exploit.
     
  6. TheCyberQuake

    TheCyberQuake Certified Geek

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    Dec 2, 2014
    United States
    Las Vegas, Nevada
    You can't just modify firmware and install it as you need the secret keys to sign it for it to pass signature checks. We are very unlikely to ever get those keys. To bypass the signature check, we would need cfw, but if you already have access to cfw you wouldn't need to downgrade anyway
     
  7. jRRRRRRRRRRR

    jRRRRRRRRRRR Member

    Newcomer
    1
    Jan 29, 2018
    Korea, South
    According to SwitchBrew (the switch wiki) you can downgrade specific versions to other specific verions like this.

    • 2.3 to 2.1, and 2.0.0,
    and
    • 3.0.2 to 3.0.1
    otherwise downgrading isn't possible without a way to bypass efuses.
     
    Madridi and TheCyberQuake like this.
  8. eddo12321
    OP

    eddo12321 Newbie

    Newcomer
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    Feb 3, 2018
    United Kingdom
    Maybe a hardware mod that would make the bootloader not check fuses?
     
  9. Yepi69

    Yepi69 Jill-sandwiched

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    7
    Nov 29, 2010
    Portugal
    Behind you
    ATM, chance is low.
    More likely a CFW than a workaround for the eFuses.
     
  10. Deathscreton

    Deathscreton GBAtemp Advanced Fan

    Member
    5
    Oct 1, 2009
    United States
    I could see CFW leading to downgrades as a way of removing eFuse checks though. As for why you'd want to download, more exploits! Downgrade, use eCFW/emuNAND to create a NAND backup and keep yourself safe from future updates. I would prefer to be downgraded as far as possible provided the system can do such a thing.
     
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