for the longest i have been trying to make romhacks for 3ds but i never could. every rom i tried to make just shows up in gateway rom menu but when i select it all it does it says is "there is nothing inserted into the game card slot" also if i try to select then open bigbluemenu and it dose say crt card but clicking it results in a sd card removed error here's the steps i take. dump my cart to the micro sd on my N3ds using gateway menu. put sd con pc and generate a ncchinfo.bin using 3DS Simple CIA Converter v4.3 put the ncchinfo.bin on root of sd card and put sd back on n3ds launch up rxrools and go to decrypt menu and hit generate xorpads, then it says done then i take those xorpads and put them on the computer and open 3ds tom tools GUI and go to Xorpad options i browse for the exefs norm xorpad ans select it, same with exeheader xorpad (rxtools does not output a romfs or exefs xropad) then i go to the rom options and hit the extract options then the unpack options (Showes no errors and completes) then i go to the unpacked folder and replace files and make edits. then i open a app called 3ds builder and browse for the folders it ask for and then choose a save location, and put the serial. (choosing media card 1 or 2 makes no difference) then it makes the .3ds file. my guess is its that 3ds builder app? im not sure edit: Fixed! this time i selected use pre-built exefs option and it worked! i have my edited smash bros working!