Fixing Earphone problem?

Hello,

I'm new to the forum so I'm not sure about procedure, but I'll start off and say that I have an iPhone4 jailbroken/unlocked with ios 5.1.1 no apple guarantee.

A few days ago, my LEFT earphone suddenly stopped working. I tried other earphones and the same happened, I also connected these earphones to my computer and they were working fine there. I went into General > Accessibility and moved the Audio Channel slide to the LEFT and there is no sound at all when the earphones are plugged in. So my first guess was that it's a Hardware issue. I took the iPhone to a local phone repair store where they replaced the audio jack socket piece for a new one. The problem, however, did not resolve. They mentioned that restoring my phone the default settings might fix it... however, I'm not too sure about it. What do you think?

If I backup my phone via iTunes and Restore, will I keep ios 5.1.1? I don't want to restore and have 6.1.4 because this cannot be jailbroken.

Any other possible ideas on how to fix it?


Thank you very much!