[Q] remove custom rom KITKAT 4.4.2 and to have the original jellybean from samsung

hi folks,

i recently ugraded my phone from jellybean to kitkat( 4.4.2)

now the problem is i dont want to be in kitkat but i want jellybean official on my phone can i have it again

is downgrading is possible

if their is a way how can i achieve it

plz do help me and share the links atleast it will be so helpfull

thanx in advance