bb3: multiple id1 troubleshooting, clarify bb3.bin

_pages/en_US/bannerbomb3.txt

@@ -40,10 +40,12 @@ In this section, you will copy the files needed to trigger the BannerBomb3 explo
   + This will download an exploit DSiWare called `F00D43D5.bin` and a payload called `bb3.bin` inside of a zip archive (`DSIWARE_EXPLOIT.zip`)
 1. Copy `bb3.bin` from `DSIWARE_EXPLOIT.zip` to the root of your SD card
   + The root of the SD card refers to the initial directory on your SD card where you can see the Nintendo 3DS folder, but are not inside of it
+  + This file does not need to be opened or extracted
   ![]({{ "/images/screenshots/bb3/bb3-root-layout.png" | absolute_url }}){: .notice--info}
 1. Navigate to `Nintendo 3DS` -> `<ID0>` -> `<ID1>` on your SD card
   + `<ID0>` is the 32-letter folder name that you copied in [Seedminer](seedminer)
   + `<ID1>` is a 32-letter folder inside of the `<ID0>`
+  + If you have multiple `<ID1>` folders, follow the instructions [here](troubleshooting#bannerbomb3)
   ![]({{ "/images/screenshots/bb3/dsiware-location-1.png" | absolute_url }}){: .notice--info}
 1. Create a folder named `Nintendo DSiWare` inside of the `<ID1>`
   + If you already had the folder *and* there are any existing DSiWare backup files (`<8-character-id>.bin`) inside, copy them to your PC and remove them from your SD card

_pages/en_US/troubleshooting.txt

@@ -107,6 +107,18 @@ The website has determined that your `movable.sed` cannot be brute-forced. Ensur
 
 ## BannerBomb3
 
+{% capture compat %}
+<summary><u>Multiple ID1 folders inside of ID0</u></summary>
+
+![]({{ "/images/screenshots/multiple-id0.png" | absolute_url }})
+
+This can occur if you've used multiple SD cards on a 3DS and then merged the contents of the SD cards together. This is done to prevent conflicting, valid data from being merged together.
+
+To fix this, you will need to determine which folder contains your data. Usually, this will be the larger (or largest) of the folders. Backup and delete the smaller one(s), then create a `Nintendo DSiWare` folder in the one that remains and move `F00D43D5.bin` to that location.
+
+{% endcapture %}
+<details>{{ compat | markdownify }}</details>
+
 {% capture compat %}
 <summary><u>DSiWare Management menu crashes without showing BB3 multihax menu</u></summary>
 Ensure that `F00D43D5.bin` is the only file in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `Nintendo DSiWare`. If it is, then re-create it with the [Bannerbomb3 Injector](http://3dstools.nhnarwhal.com/#/bb3gen).