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| {{Lowercase title}}{{Infobox homebrew
| | #REDIRECT [[3DS:Black screen unbrick#Section VI - ctrcheck]] |
| | title = ctrcheck
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| | for3ds = 1
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| | developers = StarlitSkies, FrozenFire
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| | version = 4.0
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| | releasedate = 2024-10-04
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| | github = nh-server/scripts
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| | releaseurl = https://raw.githubusercontent.com/nh-server/scripts/main/3DS/ctrcheck.gm9
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| }}
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| '''ctrcheck''' is a custom GodMode9 script that does a large number of [[wikipedia:Sanity check|sanity checks]] and [[wikipedia:Checksum|checksums]] on a 3DS' firmware and SD card to make troubleshooting easier through [[wikipedia:Fault isolation|fault isolation]], though it can also automatically fix certain issues.
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| == Required Reading ==
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| ctrcheck does not fix the majority of issues by itself, and instead only informs the user that they exist. Some of the issues it checks for may still require large amounts of knowledge to fix - this script is not a 'miracle cure' and should not be treated as such.
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| Additionally, ctrcheck cannot check whether the SD is damaged, only certain specific issues with reading its data. If you have an issue that might be caused by an SD being corrupted or formatted badly, the pages [[Formatting an SD card]] and/or [[Checking SD card integrity]] will be far more useful.
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| == Instructions ==
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| === What You Need ===
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| * The latest version of [https://raw.githubusercontent.com/nh-server/scripts/main/3DS/ctrcheck.gm9 ctrcheck.gm9]
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| ** To download, right-click/long-press the link and select <code>Save link as...</code> or similar, then rename the downloaded file to <code>ctrcheck.gm9</code> if it is not named exactly that
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| * A device that you can use to transfer files to your 3DS, either via an SD slot or via [[3DS:FTP|FTP]]
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| === Section I - Prep Work ===
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| # Power off your console and insert the SD card into your device
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| # Copy the downloaded <code>ctrcheck.gm9</code> into <code>sd:/gm9/scripts</code> on the SD card
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| # If GodMode9 either is not installed or is outdated (the latest version is v2.1.1), [[3DS:GodMode9#Installation|install the latest version now]] | |
| # Reinsert the SD card into your console
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| === Section II - ctrcheck ===
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| # Hold {{B|START}}, and while holding {{B|START}}, power on your console. This will launch GodMode9
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| # Press the {{B|HOME}} button, then go into '''Scripts...''' -> '''ctrcheck'''
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| #* If ctrcheck does not appear here, go into the folder <code>0:/gm9/scripts</code> and manually rename it to <code>ctrcheck.gm9</code> by highlighting it and pressing {{B|R|X}}, then reopen the scripts menu
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| # Based on the type of issue you're having, select one of the top three options
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| #* If you are even slightly unsure about what type of issue it is, pick '''All'''
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| # Accept any prompts to fix issues and unlock sysNAND write permissions that appear, perform data recovery and rerun the script if instructed to, and then read the results on the top screen once the script is entirely finished
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| # If you are following this guide at someone else's request, send a copy of the results to that person. Otherwise, if the results include any of the following, do the matching instructions:
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| #* <code>______ installed to firm0/firm1</code>: If the result type is <code>Information</code>, you may ignore this line. If the type is <code>Warning</code> or <code>Critical</code>, follow either [[3dsguide:updating-b9s|Updating B9S]] (if using boot9strap) or [[3DS:Fastboot3DS/Usage#Updating_fastboot3DS|Updating fastboot3DS]] (if using fastboot3DS) to get the latest version of a known good bootloader. If the type is <code>Error</code> and both FIRM0 and FIRM1 are affected, ask for help in the [[Get support|Nintendo Homebrew Discord]]
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| #* <code>Critical: NVRAM is inaccessible</code>: If your console is an old model (no ZL/ZR shoulder buttons and no C-Stick), try reseating the Wi-Fi module on the motherboard. If this does not fix it or you have a new model, download [[Media:Luma ignore cfgnor.firm|the]] special build of Luma linked in the fourteenth word of this sentence, rename it to <code>boot.firm</code>, and put it on the root of your SD card
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| #** This build does not fix the issue, only stop it from causing system crashes. You will still be unable to play DS games, and if you were unable to use Wi-Fi it will also stay broken - fixing these entirely requires a hardware replacement
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| #* <code>Warning: The SD title database needs to be reset</code>: Using [[3dsguide:images/screenshots/database-reset.jpg|this picture]] as a guide, reset the title database. After you reset, follow [[3dsguide:finalizing-setup|Finalizing Setup]] to reacquire the homebrew apps
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| #* <code>Warning: There is no boot.firm/boot.3dsx in the SD card root</code>: Follow [[3dsguide:restoring-updating-cfw|Restoring / Updating CFW]] to reacquire the file(s)
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| #* <code>Critical: NAND is unreadable at _______...?</code>: Your console's internal storage is damaged in a way that may require advanced troubleshooting to fix. Ask for help in the [[Get support|Nintendo Homebrew Discord]]
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| #* One or more of movable.sed, LFCS, SecureInfo, and/or HWCAL is marked as either <code>invalid</code> or <code>still invalid after a recovery attempt</code>: If you have a NAND backup from before this happened, [[3DS:GodMode9/Usage#Restoring_a_NAND_backup|restore it]]. If you do not, then ask for help in the [[Get support|Nintendo Homebrew Discord]]
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| #* <code>Critical: n3DS has an o3DS NAND header</code>: If you have a NAND backup from before this happened, [[3DS:GodMode9/Usage#Restoring_a_NAND_backup|restore it]]. If you do not, then ask for help in the [[Get support|Nintendo Homebrew Discord]]
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| # If any other result(s) of the type <code>Warning</code>, <code>Critical</code>, or <code>Error</code> appear, you may want to ask for help in the [[Get support|Nintendo Homebrew Discord]] and provide the full output of ctrcheck there
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| {{info|text=The results found on the top screen are also stored on the SD card in the file <code>sd:/gm9/ctrcheck_latest.txt</code> - however, if you run ctrcheck again, that file will be overwritten with the new results. To avoid this, enabling permanent logging will also append the results to the file <code>sd:/gm9/ctrcheck_log.txt</code>.}}
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| [[Category:Unbricking]]
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| [[Category:Nintendo 3DS troubleshooting]]
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