Donkey Kong Country Returns 3D (USA) in CIA format cannot be larger than 4 GB. The size should be around 2.20 GB. Did you rip the game from a physical cart or tried converting a .3ds one into CIA using GodMode9 v1.5.0? There is a bug in this particular version that causes it to incorrectly convert .3ds files into .cia.
For future reference when you run into a .3ds file that is 4 GB or larger, you can use 3DS Simple CIA Converter
to produce CIA files under 4 GB on your computer.
Edit : Just realized, GodMode9 cannot possible create larger than 4 GB CIA on the 3DS anyway due to the FAT32's 4 GB file limit. You got a bad source dump or whatever you used to convert from .3ds to .cia did it wrong.