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DowngradeFixer Switch: Difference between revisions

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Created page with "{{Infobox Switch Homebrews |title=DowngradeFixer |image=DowngradeFixerSwitch.png |description=A payload designed to fix issues encountered when downgrading Nintendo Switch firmware. |author=sthetix |lastupdated=2025/11/20 |type=Payloads |version=1.0.0 |license=GPL-2.0 |download=https://dlhb.gamebrew.org/switchhomebrews/DowngradeFixerSwitch.7z |website=https://github.com/sthetix/DowngradeFixer |source=https://github.com/sthetix/DowngradeFixer |donation=https://www.buymeac..."
 
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|description=A payload designed to fix issues encountered when downgrading Nintendo Switch firmware.
|description=A payload designed to fix issues encountered when downgrading Nintendo Switch firmware.
|author=sthetix
|author=sthetix
|lastupdated=2025/11/20
|lastupdated=2026/04/25
|type=Payloads
|type=Payloads
|version=1.0.0
|version=1.0.1
|license=GPL-2.0
|license=GPL-2.0
|download=https://dlhb.gamebrew.org/switchhomebrews/DowngradeFixerSwitch.7z
|download=https://dlhb.gamebrew.org/switchhomebrews/DowngradeFixerSwitch.7z
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|image_alt=DowngradeFixer
|image_alt=DowngradeFixer
}}
}}
DowngradeFixer is a Nintendo Switch RCM payload by sthetix that repairs common issues caused by downgrading firmware (e.g. broken Wi‑Fi/BT, NAND mismatch), intended to be launched via Hekate or a payload injector.
DowngradeFixer is a streamlined bare-metal payload designed to fix issues encountered when downgrading Nintendo Switch firmware from 21.0.0 to 20.5.0. It performs two critical operations without booting into Horizon OS.


== Features ==
* '''Automated Fix''' - Performs both key dumping and file deletion in one operation
* '''Silent Key Derivation''' - Keys are derived and saved without verbose output
* '''Flexible NAND Selection''' - Choose to fix SysNAND, EmuNAND, or both
* '''Safe Operation''' - Validates each step and reports status
* '''No Horizon OS Required''' - Runs as a bare-metal payload for maximum compatibility
* '''Multiple Reboot Options''' - Launch Hekate, custom payload, or power off
== Important Notes ==
* '''Backup First''': Always keep backups of your NAND and important files
* '''One Purpose''': This tool is specifically designed for the downgrade fix process
* '''Clean Operation''': Only performs the two essential operations - no extras
== What It Does ==
DowngradeFixer automates two essential steps needed after downgrading your Nintendo Switch firmware:
DowngradeFixer automates two essential steps needed after downgrading your Nintendo Switch firmware:
* Dumps prod.keys - Extracts encryption keys required for various homebrew tools
* Deletes file 8000000000000073 - Removes the problematic save file from the SYSTEM partition that can cause issues after downgrading


# '''Dumps prod.keys''' - Extracts encryption keys required for various homebrew tools
See [https://github.com/sthetix/DowngradeFixer/blob/main/README.md readme] for usage.
# '''Deletes file <code>8000000000000073</code>''' - Removes the problematic save file from the SYSTEM partition that can cause issues after downgrading


== Usage ==
== Features ==
<ol>
* Automated Fix - Performs both key dumping and file deletion in one operation.
<li><p>'''Recommended:''' Place '''Minerva''' on your SD card for optimal performance. You can get it from the latest [https://github.com/CTCaer/hekate/releases Hekate] release:</p>
* Silent Key Derivation - Keys are derived and saved without verbose output.
<pre>/bootloader/sys/libsys_minerva.bso</pre></li>
* Flexible NAND Selection - Choose to fix SysNAND, EmuNAND, or both.
<li><p>Launch <code>DowngradeFixer.bin</code> using your preferred payload injector or chainloader.</p></li>
* Safe Operation - Validates each step and reports status.
<li><p>Select '''&quot;Fix Downgrade&quot;''' from the main menu, then choose:</p>
* No Horizon OS Required - Runs as a bare-metal payload for maximum compatibility.
<ul>
* Multiple Reboot Options - Launch Hekate, custom payload, or power off.
<li>'''Fix SysNAND only''' - Process only the system NAND</li>
<li>'''Fix EmuNAND only''' - Process only the emulated NAND (if available)</li>
<li>'''Fix Both''' - Process both SysNAND and EmuNAND</li></ul>
</li>
<li><p>The payload will silently:</p>
<ul>
<li>Derive encryption keys and save prod.keys to <code>/switch/prod.keys</code></li>
<li>Use those keys to access the encrypted SYSTEM partition</li>
<li>Delete the file <code>8000000000000073</code> from the SYSTEM/save partition</li>
<li>Display the results for each step</li></ul>
</li>
<li><p>Reboot using one of the menu options:</p>
<ul>
<li>'''Reboot to Hekate''' - Boots <code>bootloader/update.bin</code> if present</li>
<li>'''Reboot to Payload.bin''' - Boots <code>payload.bin</code> from SD root if present</li>
<li>'''Power off''' - Safely powers down the console</li></ul>
</li></ol>
 
== When to Use This ==
Use DowngradeFixer when:
 
* You've downgraded your Nintendo Switch firmware
* You're experiencing boot issues or system instability after downgrade
* You need to extract prod.keys and remove the problematic save file
 
== Mariko-Specific Keys ==
Mariko units (V2 and Lite models) contain unique keys in protected keyslots. For these keys, you'll need to:
 
# Use <code>/switch/partialaes.keys</code> file
# Use a brute-forcing tool like [https://files.sshnuke.net/PartialAesKeyCrack.zip PartialAesKeyCrack]
 
See the original Lockpick_RCM documentation for detailed instructions on Mariko key extraction.


==Screenshots==
==Screenshots==
https://dlhb.gamebrew.org/switchhomebrews/images/DowngradeFixerSwitch-01.png
https://dlhb.gamebrew.org/switchhomebrews/images/DowngradeFixerSwitch-01.png


==Changelog==  
==Changelog==
'''v1.0.1'''
* Changed the UI orientation to landscape.
* Applied cosmetic enhancements using the same color nuance as TegraExplorer-Ext and Lockpick_RCM_Pro.
* No new features added.
'''v1.0'''
'''v1.0'''
* First Release.
* First Release.
Line 89: Line 48:
== Credits ==
== Credits ==
This project is a streamlined version built upon:
This project is a streamlined version built upon:
* '''[https://github.com/sthetix/Lockpick_RCM_Pro sthetix]''' - Lockpick_RCM_Pro
* [https://github.com/sthetix/Lockpick_RCM_Pro sthetix] - Lockpick_RCM_Pro
* '''[https://github.com/THZoria/Lockpick_RCMaster THZoria]''' - Lockpick_RCMaster base
* [https://github.com/THZoria/Lockpick_RCMaster THZoria] - Lockpick_RCMaster base
* '''[https://github.com/shchmue shchmue]''' - Original Lockpick_RCM
* [https://github.com/shchmue shchmue] - Original Lockpick_RCM
* '''[https://github.com/CTCaer/hekate CTCaer]''' - Hekate bootloader and libraries
* [https://github.com/CTCaer/hekate CTCaer] - Hekate bootloader and libraries
* '''[https://github.com/Atmosphere-NX/Atmosphere Atmosphere-NX]''' - Falcon keygen
* [https://github.com/Atmosphere-NX/Atmosphere Atmosphere-NX] - Falcon keygen
* '''ReSwitched community''' - Development support
* ReSwitched community - Development support


== External links ==
== External links ==
* Github - https://github.com/sthetix/DowngradeFixer
* GitHub - https://github.com/sthetix/DowngradeFixer

Latest revision as of 03:13, 27 April 2026

DowngradeFixer
General
Authorsthetix
TypePayloads
Version1.0.1
LicenseGPL-2.0
Last Updated2026/04/25
Links
Download
Website
Source
Support Author

DowngradeFixer is a streamlined bare-metal payload designed to fix issues encountered when downgrading Nintendo Switch firmware from 21.0.0 to 20.5.0. It performs two critical operations without booting into Horizon OS.

DowngradeFixer automates two essential steps needed after downgrading your Nintendo Switch firmware:

  • Dumps prod.keys - Extracts encryption keys required for various homebrew tools
  • Deletes file 8000000000000073 - Removes the problematic save file from the SYSTEM partition that can cause issues after downgrading

See readme for usage.

Features

  • Automated Fix - Performs both key dumping and file deletion in one operation.
  • Silent Key Derivation - Keys are derived and saved without verbose output.
  • Flexible NAND Selection - Choose to fix SysNAND, EmuNAND, or both.
  • Safe Operation - Validates each step and reports status.
  • No Horizon OS Required - Runs as a bare-metal payload for maximum compatibility.
  • Multiple Reboot Options - Launch Hekate, custom payload, or power off.

Screenshots

DowngradeFixerSwitch-01.png

Changelog

v1.0.1

  • Changed the UI orientation to landscape.
  • Applied cosmetic enhancements using the same color nuance as TegraExplorer-Ext and Lockpick_RCM_Pro.
  • No new features added.

v1.0

  • First Release.

Credits

This project is a streamlined version built upon:

  • sthetix - Lockpick_RCM_Pro
  • THZoria - Lockpick_RCMaster base
  • shchmue - Original Lockpick_RCM
  • CTCaer - Hekate bootloader and libraries
  • Atmosphere-NX - Falcon keygen
  • ReSwitched community - Development support

External links

Retrieved from "https://www.gamebrew.org/index.php?title=DowngradeFixer_Switch&oldid=204740"

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