EmuNAND can't install cia FBI

Having used this guide

https://gbatemp.net/threads/tutoria...ncluding-emunand-coldboot-cia-manager.405589/

I'm now finally done, but when trying to boot a .cia in FBI, it says

Install failed!
TTCDF0JAPRFCIA.cia
source: SOURCE_FSFILE_WRITE (0x1c)
Module: MODULE_NN_AM (0x20)
Level: LEVEL_STATUS (0x19)
Summary: SUMMARY_INVALID_ARGUMENT (0x7)
Description: <unknown> (0x1)

I'm sure I'm in EmuNAND since when I go to settings it says RX-E...

EmuNAND can't install cia FBI