I've never changed the Boot Logo (aka Splash Screen) before but, I believe that one or more of the following threads may be helpful for what you are looking to do and don't be afraid to ask for some member guidance within one of them.
There's more on the forum but, this will help give you a good start.
I DO NOT provide support via PM unless asked/requested by myself. PLEASE keep it in the threads where everyone can share.
What ROM are you using? It is very easy to change boot logo if you use Substratum. You must be using a custom ROM with oms commits. I recommend resurrection remix for the s5 KLTE. You must first be rooted with unlocked bootloader and a custom recovery like Twrp. You can find everything you need here on XDA if you search. I hope this helps.
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