How can I get an earphone slot working again or how do I downgrade the os?

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How to get earphone slot working again or how to downgrade os

I had os kitkat4.4.2, everything worked great, but I updated to 4.4.4 a few days ago, and since then , by headphone slot on my galaxy s5 stopped working(gif don't work with the system's messening app too, but I'm not as worried about that ). I want to know how to fix it or atleast how to downgrade my os back to 4.4.2