Same with my phone. Video player is not working properly after update but ur headphone will run just attach headphone then lock the screen & again unlock it... headphone will work... but i'm still trying to find out the issue with video😓
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I found a solution which solved my video issue 1. Power off the phone 2. wait for 10 secs 3. say some magical spells 4. Power on Videos started working in the gallery and Headphone problem solution 1. connect headphone 2. open settings Your Welcome 😁