Xperia Z2 Build number 17.1.1.A.0.402 messing up

[Msimbwa]

Hi Colleagues 

I have recently updated my Xperia Z2 with a new software build number 17.1.1.A.0.402 as my phone preempted me to do so, but unfortuanately after the update, most of the time my phone is misbehaving, like giving messages such as process com.android.phone has stopped, or contact has stopped or even sometimes when there is an incoming call aftershort while it leaves only notification light to indicate the incoming calls but you can not pick that call. This is annoying and giving me difficult time. Any help please. Thank you

[Thommo]

The only thing you can do is to perform a system repair and see if that fixes the issue

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 - 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

[HussainQuadri]

Or you could try making a backup in backup and restore app, then factory reset the device.

Then restore the backup.