Game won't boot after installing .cia from fbi, Kernel panic error

[dude8]

Hi,
I recently tried to install fire emblem fates translated Japan-only dlcs, after making them a .cia file along with other standard dlcs by following a guide, but then my game crashes as soon as it starts loading sd card content.
This is the error:
An exception occurred
Processor: Arm11(core 1)
Exception type: prefetch abort (kernel panic)
Fault status: Debug event
Current process; fs (0000000000000000)

I found out that deleting and reinstalling the European dlc pack ( downloaded from hshop like I did for the Japanese dlcs too) actually solves this error, but then the .cia doesn't appear to work, and reinstalling it just takes me to that situation again
It definitely isn't sd card problem since it still allows me to download dlcs over and over

My guess is that those Japanese-only dlcs are still Japan-locked thus my conquest cartridge refuses to load them, but I don't know how to unlock them, or maybe the .app files get overwrited each other since they are both in the .cia and the dlc pack
I'm not even sure fbi actually installs it because I can install it over and over and it doesn't seem to occupy any space