Homebrew n3dsxl on 10.3 won't downgrade

[DarkRioru]

I placed my 9.2.0-20U.ttp file I got from from justpingo's ktm downgrades and I placed it into my sd card, booted up sysupdater, and when I clicked on the Y button and it only took one second for the 10 second thing to pop up and when I open the system settings to see what firm im on, it still says 10.3

N3dsxl
10.3
Menuhax
mashers grid launcher