Step 1b: Missing bb3.bin

You need to put bb3.bin in this location. To do so:

Get your DSIWARE_EXPLOIT.zip file. If you don't have it, get it from here using your movable.sed file that you got from Bruteforce Movable. Then, click (or double-click) on it to open it. You should see something like this:

Then, you can drag-and-drop it to the SD Card window:

Got it, next step

It won't let me copy the file