Hi welcome to the forums.
Is that the international galaxy s5?
Best place you can ask is in the s5 forum but have you tried a factory reset to try n fix any bugs or do you just hate the update full-stop?
PS I don't think any Samsung can be downgraded below 4.3 (especially the s5 that has never even had 4.2
^This. There is no way of downgrading below the software version the phone was originally released with, since no older versions will every have been made for that hardware.
Unless you meant "4.4.2" but lost one of the "4"s, in which case as Funky says the device forum would be the place to get the best answer (really only repeating this in order to include the link, in case you don't know where the device forum is).
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