Well if everything failed and you havent used FBI injection on your sysnand:
reformat Emunand through the gateway launcher, install rxTools anew, update your emunand (shouldnt be necessary actually), use fbi Injection on your emunand (should work now because your new emunand has the H&S from your sysnand) and install FBI.
Basically: just follow the tutorial again
https://gbatemp.net/threads/tutorial-installing-rxtools-custom-firmware-3ds-and-2ds.390867/
Or did you use FBI injection on your sysnand? Then forget it.
reformat Emunand through the gateway launcher, install rxTools anew, update your emunand (shouldnt be necessary actually), use fbi Injection on your emunand (should work now because your new emunand has the H&S from your sysnand) and install FBI.
Basically: just follow the tutorial again
https://gbatemp.net/threads/tutorial-installing-rxtools-custom-firmware-3ds-and-2ds.390867/
Or did you use FBI injection on your sysnand? Then forget it.
