3DS:Ctrcheck

ctrcheck is a custom GodMode9 script that does a large number of sanity checks and checksums on a 3DS' firmware and SD card 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, ctrcheck cannot check whether the SD is damaged in any way. 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.

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 * 3) If GodMode9 either is not installed or is outdated (the latest version is v2.1.1), install the latest version now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
 * 3) Based on the type of issue you're having, select one of the top four options
 * 4) * If you're at all unsure about what type it is, just pick Full
 * 5) Accept any prompts to fix issues and unlock write perms that appear, then read the results on the top screen once the script finishes
 * 6) If they say any of the following, do the matching instructions:
 * : Follow either Updating B9S or Installing fastboot3DS to get the latest version of a known good bootloader
 * 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 already updated and you can ignore this line)
 * : Download [[Media:Luma_v13.0.2_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
 * : Using this picture as a guide, reset the title database. After you reset, follow Finalizing Setup to reacquire the homebrew apps
 * : Follow Restoring / Updating CFW to reacquire the file(s)
 * 1) * 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.