[Q] 4.3 is not booting but 4.4 is topic

i have been using 4.4 (CM,OMNI,Vanir,etc..) for a long time, now i want to go back to 4.3.1 (tried CrDorid,CM,Beanstalk) and all the 4.3 Roms i get boot loop... why is this happening?

sorry for my bad english... and thx! :D