are you sure? where did you hear about this?
anyway, make the region free icon.bin - not a problem.
I can load these GBA CIA games on my USA N3DS 9.0.0-20U running Pasta 1.2.1, but I have to use DevMenu/FBI/BBM to launch them.
e045 - F-Zero for Game Boy Advance (GBA)(Virtual Console)(eShop) (JP)
e046 - Fire Emblem - Seima no Kouseki (GBA)(Virtual Console)(eShop) (JP)
e047 - Hoshi no Kirby - Kagami no Daimeikyuu (GBA)(Virtual Console)(eShop) (JP)
e048 - Made in Wario (GBA)(Virtual Console)(eShop) (JP)
e049 - Mario Kart Advance (GBA)(Virtual Console)(eShop) (JP)
e050 - Mario vs. Donkey Kong (GBA)(Virtual Console)(eShop) (JP)
They
do not make a Package File for me to open. (They are all Japan Region.)
I have the same exact set in USA Region, and they
do make a Package and run from the 3DS Menu.
But... even if the ICON.BIN is Region Free, none of the computer based CIA Creators I can find can make a working GBA CIA.
I would venture to guess that all of the GBA CIA files were created using FunkyCIA and therefore are Region Locked. (I could be wrong here)