I upgrade my iph4 to ios 7.1.2 and the microphone is not working on video camera, is not working anymor also the microfon on speaker mode, please help me

Hy guys, i upgrade my ios 7.1.1 to 7.1.2 and now iths not working anymore my microphone on video record, the camera is working , is recording but without sound, and also the microphone on speaker, when i activat the speaker the microphon is not working. I do a full reset on my iph but still not working , also my girlfriend have same problem.Please help me, thx.

To rule out a software issue, try to set it up as new device, without using the latest backup, explained in this article:
How to back up your data and set up as a new device
If this does not help, the problem might be hardware related and the phone needs to be serviced by Apple or an Authorized Apple Service Provider:
iPhone - Contact Support - Apple Support

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