proximity sensor issue c6833 4.4.4 HELP!

[mifzal]

Im on z ultra c6833 with the latest version 4.4.4 updated 2 days ago with build number 14.4.A.0.108.
i found out that my proximity sensor does not functioning. The screen will not dim if i answered a call near to my ear. 

I try to do this after read on other threads:
1. Go to your Dialer, and enter *#*#7378423#*#* to access the Service Menu.
2. Go to Calibrations 
3. Go to Proximity Sensor
4. Choose "Calibration" and then "Start".

but in my case, i dont have the calibration button. 

someone please help me? is it the software or hardware issues on my z ultra. ? is there fix to my issue?

[Samuel1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

I suggest that you try to repair the phone software using PC Companion..

Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?

If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.

[Perusi]

Here is a trick i did for my c8633. I installed the APP called On Call Proximity. And i enabled it to lock screen on call (yes i gave permissions) and i made a call. Then i disable the option from app to lock the screen. Now it works try it.

[Perusi]

Never mind. The bug is back after 2 or 3 calls

[asm2me]

I have the same issue after upgrading to kitkat 757, 761 108 , all are having the same issue

when I go back to JB it works fine

my mobile is zUltra 6802

[mifzal]

Really? i have restore the latest firmware by installing by using pc companion, same problem though, if that really an issue for this kitkat android, sony really need to update it, im having problem with the call and auto brightness issues cause of this proximity sensor

[Dimos54]

Samuel you are not helping... 670€ phone and I can't answer a call...how can I repair the phone software using PC Companion.be more specified

[_alexdon_]

Download it from here:

http://www.sonymobile.com/gb/tools/pc-companion/

Install,open,connect your device so it will discover it.Click on repair phone/tablet and follow the steps provided.

[Dimos54]

I did it and once again nothing ....
When I go to my Dialer, and I enter *#*#7378423#*#* to access the Service Menu i dont have the calibration button.

[_alexdon_]

Stop by a sony service:

http://www.sonymobile.com/global-en/support/contact-us/