who says she didn't use soundhax?
yes, if you did everything right up until that point, then b9s should already be installed. :) you just need a way to launch FBI.
if you start up your console and hold the "Start"-button, does GodMode9 launch?
hmmm, i don't know about that error code, maybe ctr-hhtpwn isn't working(?).
but i did the dsi downgrade with fieldrunners on my n3dsxl a few days ago. i had both systems upgraded to 11.2 to do the system transfer and everything worked out great. there really is no need to keep 3ds#2 on a lower...
normally steelhax works after some tries...
but yeah, it is just a secondary entrypoint for the homebrew channel on 3DS#2 before downgrading.
so as long as you can run ninjhax, you should be fine without steelhax.
to me it sounds like he wants to view the decrypted contents of a 3ds-file.
i don't know if that's actually possible right on the console, but i think there are decrypted game-rips made to use with the citra-emulator.
so one could download those to view the actual contents of a game or decrypt...