like smosh gonna say: Shut Up
its juste a question damn-it
now now, don't need to be rude, i know gbatempers make a circle jerk of it, but if you turn out against them, you are now the one being wrong, and making yourself look bad and worth of that circle jerk..
if you wanna be rude, i may even join the circle jerk....
to answer your question, no its not possible.
unless you had made a nand backup (protip, if you dont know about nand backups, you didnt made it) that way you could restore the system like a "save stated"... you can't use other peoples nand backups, because they are specific to each console.
and how to make one you will ask? you need to open the console, and solder some wires to make an adapter. if you want more info about this, you can search for 3ds nand backup on google (it probably will redirect you to a gbatemp thread)
as for downgrade using cards or without the nand backup. not possible...