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How to Downgrade from Lollipop to Kitkat on Galaxy s4 Battery Draining too Fast!

I am new to Smartphones. I only owned very few of them and I have never understood how to Mod them or install Roms or any of that stuff. However since I updated my Galaxy s4 from Kitkat to Lollipop the Battery is draining super fast and there is heat issues with the phone. Basically the batter will drain %1 Per Minute on Lollipop. I just got the phone few days ago, but before the Update, I recall the phone not having any issues.

I did a Factory Data Reset with no backups (Intentionally) but it had already saved Lollipop as the OS. I want to reverse back to Kitkat so I can get a fully functional phone. The problem is that I never done this before.

I wanted to know how hard is it for my first time? and if someone could Link me a GOOD (Proper) Youtube tutorial on how to do this? There are many videos so I am not sure which one to really follow. Also I want to know what Version do I Pick of Kitkat to install?
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Hi and Welcome to Android Forums,@EpicSurvivor

Read this and it will help you with your venture:
http://forum.xda-developers.com/galaxy-s4/general/i9500-easy-to-downgrade-official-t3036258

Thank you very much! My second question would be.
Can I download the Firmware from a different website other than Firmwares SamMobile website? What is another trusted website for Firmware? Could you provide me the link? The Firmwares SamMobile website has super slow download speed.

Thanks!

EDIT: Is this website legit to get Firmware? or are those outdated versions?
http://samsung-updates.com/
 
Check here:
http://galaxys4root.com/galaxy-s4-stock-firmware/
But even though SamMobile might be slow downloading,I think its the best for getting the correct firmware for your device.
Okay thank you! I am feeling too nervous I might brick my device. I am going to look for a person near me who I can pay to do it. I'd rather not say where I am at but I am sure there has to be some place where they will do it.

I learned how to build a Computer with 1 year of classes lol but I sure don't got a clue what to do with a Smartphone.

Thanks for the help anyway!
 
So I just paid $20 to get the phone Downgraded to Kitkat but the Battery life is still draining fast. I am not sure if there were files left behind in the system, or if its just a battery that it needs. Its pretty annoying. Was listening to music @ 73% and about 30 minutes later the battery was down to 40%. I might have to return the phone or sell it. This is not acceptable.
 
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