First of all, this isn't a firmware issue at all!!!
It's the headphone jack at fault. Try different headphones, try not plugging the headphones fully, bend the connectors properly and check the soldering, redo it too if necessary.
Whatever you do, don't upgrade the firmware. It won't fix it.
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For my dreams i hold my life...
I miss my Meizu M6SL... Currently rocking a Sony Ericsson w595 on Samsung in-ear phones. Does fine, but it's not a chipod... 
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