I was installing arm9loaderhax (at http://2xrsa.3ds.guide) and it didn't turn off. I waited an hour, pressed A button and Select and nothing happened.
I removed the SD card and powered on, the screen had some color changing but I switched off Power-Saving Mode and the screen is fine.
I then formatted the SD card - (it said that the sd card was corrupted in my pc). Now I am at 2.2.1 version - my 3ds works but I don't know how to get out of it. Is it bricked? Here is my n3ds without sd card.