I don't really know, i'll tell you what it says:
SD mode, install CIA:
Install failed, summary invalid argument 0x7 description invalid combinaison 0x3ee.
And it's the same with the launcher.cia. Can't install it on Emunand.
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So, (excuse me for double post)
I have TWLFirm_N3DS.cia installed on sysnand,
Launcher.cia on Emunand (installed with devmenu, failed with FBI).
TWLFirm_N3DS.cia NOT installed to Emunand.
Result: when I put the Blue GW card on Emunand, small freeze, and if I launch the Launcher.cia: Black screen.