Downgrade Galaxy S4 GT-19515 back to KITKAT?

[shaffyx]

So I have this odd Model of Galaxy S4 (GT-19515), could someone give me a guide on how to downgrade it from Lollipop back to Kitkat?

 

[Rukbat]

Assuming you can find a KitKat ROM for the 1015 (each model uses a different ROM, so don't put in a KitKat for a different S4), see [Samsung] How to flash Stock ROM via ODIN. (It's actually trivial - and very boring, so have something to do for about 10 minutes.)

 

[shaffyx]

I can't seem to find rom for the 19515, I'll try try the xda forums...

If someone knows where I can get one, please tell me.