3DS:Ctrcheck

ctrcheck is a custom GodMode9 script that does a large number of sanity checks and checksums on a 3DS' firmware to make troubleshooting easier through fault isolation, though it can also automatically fix certain issues.

Required Reading
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.

Additionally, at current ctrcheck only does checks within the NAND. If you have an issue that might be caused by the SD card instead, the pages Formatting an SD card and/or Checking SD card integrity may be more useful.

What You Need

 * The latest release of ctrcheck.gm9
 * To download, right-click/long-press the page and select  or similar, then rename it to   if it is not already called that
 * A device that you can use to transfer files to your 3DS, either via an SD slot or via FTP

Section I - Prep Work

 * 1) Power off your console and insert the SD card into your device
 * 2) Copy the downloaded   into   on the SD card
 * 3) If GodMode9 either is not installed or is outdated (the latest version is v2.1.1), install the latest version now
 * 4) Reinsert the SD card into your console

Section II - ctrcheck

 * 1) Hold, and while holding , power on your console. This will launch GodMode9
 * 2) Press the  button, then go into Scripts... -> ctrcheck -> Everything
 * 3) Accept any prompts to unlock write perms that appear, and then read the results on the top screen once the script finishes
 * 4) If they say any of the following, do the matching instructions:
 * : Update your bootloader using this page of 3DS Hacks Guide
 * 1) ** This also applies if the  text instead reads , but if it reads   then ask for help in the Nintendo Homebrew Discord (if the text reads  , your bootloader is up to date and no update is required)
 * : Download [[Media:Luma12.0.1_ignore-cfgnor.firm|the]] special build of Luma linked in the second word of this sentence, rename it to, and put it on the root of your SD card
 * 1) ** Even with this custom version, you cannot use Wi-Fi or play DS games on the console with this error - fixing it entirely requires a hardware replacement
 * 2) * Any text that ends with : The error that was fixed may now allow your console to boot. Reboot after checking the rest of the output and see if the HOME Menu appears
 * 3) * If any,  , or   that is not in the above set appears, ask for help in the Nintendo Homebrew Discord and provide the full output of ctrcheck.