Can i downgrade s5 neo to kitkat

[AC Question]

Can i downgrade s5 neo to kitkat and how?

I want me old os of the s3/note 2 back :'(

 

[Rukbat]

If you can find an S5 Neo KitKat ROM, sure (see [Samsung] How to flash Stock ROM via ODIN). But it has to be a ROM for your particular model phone. Android doesn't use a single ROM for all phones.