I have also a gateway already
and my 3DS stays on 9.2.20E
My 3DS-XL is 9.4.21E, cause there's my amabassador games on and that i use for online gameplay (and this one i will always updates to latest FW)
My Kids 2DS is also updated to 9.4.x and always will, i still preffer to buy my games! (All games i know and wanted i bought, some are still on my wanted list, but i need to spread it out, no need to buy a game when the others still aren't finnished)
Gateway/Sky3DS more for fun and collection and homebrew then piracy. (That was so with GB/GBC/GBA and NDS) but i do try out games i don't know and there for would never buy, sometimes it leads to me buying the actual game
Specially with kids games, my daughter often say, i want that game, i bought it as present and then find out she doesn't like it that much (what a waste) now she can try it out on my 3DS and when she actually like it, i can buy it when it fits (mostly as pressent when she does well at school. to play on her 2DS
I just tough i could get the update on the 3DS-XL and copy it to the 3DS, but i already figured out, that doesn't work
it also install something to the nand.
Thanks for the help