Downgrade from 6.01-4.4.2

Is it possible, I've seen a video where it is done but need to go to LP first, I much prefer kk on s5 as running a ported s5 kk on my s4 and wish to keep it. Any time I flash a kk stock based rom via twrp it boots to boot animation and then freezes and reboots. Any one done the downgrade?

SM-G900F Unlocked.
Baseband- G900FXXU1CPB8

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