Well, i have sysnand 4.2 and cfw in the same version (my pokemon AS savegame was created in a 9.6 emunand so it doesnt have key's problem) and i though that i can backup it's savegame with savedatafiler but when i open it says 'ctr-broken' and ntr 1.0 with savegame manager plugin also didn't work because, due im in 4.2, my 3ds doesnt boot the game.

do you think there's something that i'm not doing right? Thanks!

 

Or use the legit version cia and the save data transfert tool. (but you won't be able to put your save back in the cartdrige)