skater: clarity based on common troubleshooting

- WinRAR causes skater to fail (lol)
- Let people know that probably something is wrong if the exploit is still unsuccessful within ten attempts
- Clarify that there is only one language setting on JPN/KOR consoles, but that users should still open system settings (to trigger a reboot)
- Add winrar notice to key-info

docs/installing-boot9strap-(super-skaterhax).md

@@ -91,6 +91,8 @@ A video detailing these steps is available [here](https://www.youtube.com/watch?
 1. If your console displays:
     + **"The Homebrew Launcher" screen**: Continue to the next step
     + **A white "Error has occurred" message box**: The exploit failed due to random chance. Open System Settings, change the language to a different one (if possible), then retry this section. Be persistent; you may have to repeat this sequence up to ten times
+        + On JPN/KOR region consoles, there is only one language setting. On those consoles, you should open System Settings, close it, then retry this section
+        + If the exploit is still unsuccessful after more than ten attempts, there may be a problem with your files or SD card. Ensure that you are **not** using WinRAR to extract files, as it is known to cause issues
     + **A black screen that says "An error has occurred"**: Your file placement is incorrect. Ensure that the super-skaterhax files are on the root of the SD card
     + **A yellow screen**: Homebrew Launcher failed to open due to random chance. Hold the POWER button until the console turns off, then retry this section
     + **[The word "Text"](/images/screenshots/skaterhax/skater-old3ds.png)**: You have an Old 3DS, where this exploit **does not work**. If this is the case, you should follow [MSET9](installing-boot9strap-(mset9)) instead

docs/key-information.md

@@ -143,6 +143,12 @@ When you are told to "copy (file) from (file).zip", that means that you need to
 
 On most operating systems, you can extract files by double-clicking the file. If this doesn't work, you can install a reputable third-party extraction tool like [7-zip](https://7-zip.org/) instead.
 
+::: warning
+
+The Windows application "WinRAR" is specifically known to cause compatibility issues with the 3DS, particularly with custom firmware installation exploits. If you are on a Windows computer, you should use either the default File Explorer or 7-zip to extract files.
+
+:::
+
 ::::
 
 :::: details What are file extensions?