Problems sound call

[Mickbeth]

Hello,

I bought, there 2 weaks ago, an Xperia Z2 with my point of french orange account. It's a amazing portable...But when i called someone, 3g to 4g, i had a terrible sound. I called the orange support and 4 days ago i had a new one...This one worked well and there was no sizzles when i spent a call. At home, i had a notification of what there was a new firmware. I maked it...And  terrible sound and sizzles came back...this next is my about phone :

Android version : 4.4.2

Build number : 17.1.2.A.0.314

I have a orange fuc... version...(sorry about that but the orange app is very useless)

Maybe if i downgrade ? or i instal the version of sony ? Dont know.

If someone have an advice. I take it 😛

Thank a lot.

Mickbeth.

[Thommo]

Try performing a system repair as this will often fix issues after an upgrade - This will factory reset your phone

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[MVC]

Firmware upgrades switch noise cancelling / enhancement options on by default.

Turn noise cancellation and voice enhancement options OFF.

You may still have some problems with the other party not being able to hear you clearly but that's an unfortunate trait of the Z2.

[Mickbeth]

First of all i would like to thank you for the faster of your answer. I let try your advices and i'll post what i have done. ^^