ntrs abadoned and its not open source thats the problem so youd have to code your own cheat engine from scatchWell, what would happen if you boot an extended memory game, let's say Super Mario Maker, press Home to go to the Home Menu (But don't close the game) and start another extended memory game? (Smash).
If it doesn't reboot the extended memory mode, then NTR can get support for extended memory games aswell!
An old 3DS only NTR sounds funny lol, but so true in this case XD
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also the homebrew launchers also already capable of using more then 64mbs of ram