Problem with headset

[Link_SM]

I have a Xperia SL. Everything works fine. I had it updated to Jelly Bean. I barely used (if not said never used the headset plug in). Today when my mp3 was out of battery, I plug my earphones in my phone, and it didn't recognize the earphone (i tried once before when still use ICS and it worked, same earphones from Sony Mp3). I tried with the set came with the phone, it doesn't recognize either. I don't know how to fix it, any idea? Thanks a lot.

[Sam]

If this has happened since updating the phone I would advise trying a repair to reload the firmware:

To repair the phone software
1.     Install PC Companion on a Windows PC from Support
2.     In PC Companion, under Support Zone and click Start.
3.     Under Phone Software Update, click Start.
4.     Click repair phone.
5.     Follow the on-screen instructions. 

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[AkellaKat]

I have Xperia S. When I take the headset (Creative MA930 for smartphones)  out, the smartphone still "thinks" that it's in. So I can't use the phone's dynamics and microphone to talk and listen to the interlocutor.

Reset helped only once until next headset using.

Also I can't use software reparing because backup copying can't be complete.

Please, help!