but if you're smart and don't get a piece of shit product then even if you set it to day 4 you can just set it back to day 1 - 3 and fix it. just don't mess up the connection with the computer and make sure none of your shit's faulty and the cart tabs are clean and the connection isn't botched and most of the time it won't royally fuck up your save. and don't forget to always use the save backup feature. powersaves is also a save backup device. make a backup and make sure you didn't fuck up making it. always have a nonbotched backup before using any save mods. the only reason I use kazowar's arcode is that it's much easier than save hacking and doesn't require a computer. i run and test codes on the fly with the lunarcookies arcode site that creates a qr code all in the web browser on my smartphone. only thing to wait for now is a complete android app that makes a hotspot without phone service or wifi and runs a qr code based arcode webserver much like gateway go for AndroidAr ds is for ar games not 3ds there's no cheat cart for 3ds games just a save mod and I would avoid datel at all costs.
Editing a save for example majoras mask to be in day 4 which you can't get in game will just break your game, plus my past experience with their cheaply made products, if you write their hooky save data and it fucks up your cart is at risk of been fucked too.