Recently my device updated to KitKat 4.4.2 and it has been going crazy ever since.

system ui crashed and wont turn on - Sony - Comunidad

Sony https://community.sony.es > m-series > td-p
... Xperia Companion. This will do a clean installation of the latest ... August 2017.

August 2017. Keep getting " unfortunately UI has stopped working" message.

..

Scan your mobile for Viruses. and check the setup for the line access

You can find information on all versions at the Android.com website and in google play you can get Android quick start guide, Android 4.4 (KitKat): US English version EBook and its free.
Or go to the manufacturer and get the user manual for a phone with 4.4.2

http://forums.androidcentral.com/android-4-4-kitkat/492234-where-can-i-find-user-manual-android-4-4-2-kitkat.html

UPGRADE ANY ANDROID PHONE TO KITKAT

METHOD 1:

If you don't want to take any risk and don't want to mess with your phone or computer you can easily upgrade your android to kitkat official look to have some new and best features in android there is lot of android kitkat launcher in the android play-store and here i am going to show you some of best and free kitkat launcher to gave whole new look to your android phone and have kikat experience in any phone which have gingerbread or jelly bean android.
KITKAT EXPERIENCE WITH KITKAT LAUNCHER

KITKAT LAUNCHER

1. Download One of the best KitKat Launcher.
2. Fully Loaded with all new functions of kitkat.
3. All the functions are available free of cost.
4. Easily install and have all new kitkat look in your android phone

KK LAUNCHER (KITKAT LAUNCHER)

1. Download Another best KK Launcher (KitKat Launcher).
2. This is also Fully loaded anf fully free of cost available in android play store.
3. Give all new look to your bored android jelly bean.

METHOD 2: Here is How Upgrade Any Phone To KitKat So lest have a look ant some steps to update your jelly bean android phone to kitkat.
Important Aspects To Know

• Users must have a proper backup of your data, apps and settings
• Ensure that the device is fully charged
• USB Debugging must be enabled

Odin works only in Windows. Users of other platforms like Linux OS (such as Ubuntu) or Mac OS should use CrossOver Utility to run Odin in their OS ' Or There is some more tools to flash kitkat rom find matched for your android or comment down and let me find and then tell you
Note : The users must proceed at their own risk while trying out the manual installation

REQUIREMENTS :

1. At-least Have 1 Gb Ram Mobile phone.
2. Al-Least Have Quad Core mobile Phone.
3. With Fast GPU.
4. And Of-cause An Android Phone

HOW TO INSTALL CUSTOM KITKAT ROM IN ANY ANDROID

1. First of all you need to find update file for your android phone that you are using. you can comment down if u can't find files for your android phone i can find for you .
2. Download Custom Rom or any one you want based on Android 4.4.2 KitKat and Google Apps for Android phone your computer
3. Connect your android to PC via USB and copy the ROM and Google Apps packages to the root folder of your handset's SD card without extracting them.
4. Disconnect USB and turn off your phone.
5. Get into the Recovery Mode by pressing and holding Volume Up, Home and Power buttons together
6. In the Recovery Mode, perform a factory reset by selecting "wipe data/factory reset." Use the Power button to select options. Now, perform a cache wipe by selecting "wipe cache partition."
7. Now wipe the dalvik cache as well. From CWM recovery, go to "Advanced" menu and then select "wipe dalvik cache."

Android 4.4 is available on some devices out of the box. You can tell by looking at the notifications bar at the top of the screen. If you're on 4.4 then all the icons should be white. Earlier versions appear blue.
If you want to double check, head to the settings app on your phone and look for About Phone under System. Scroll down a little and you'll find the Android Version bar which lists the version currently running.

Despite being released last year, only a handful of Android handsets currently use Android 4.4, though the list is ever-growing. First, you'll need to check online to see if your device has the update. You can either do this online or on your gizmo. For the latter, head to the Settings app and find About Phone under System. From here press System Updates. Your phone will do a little searching and either find the update or tell you the software is up to date.
A huge array of handsets from major manufacturers including (but not limited to) Sony, Samsung, Google, HTC and LG already support the upgrade to Android 4.4, with more being added by the month.
3. Check the update is ready on your phone
Even if the update has been released for your make of phone/tablet, it may not have come to your individual device just yet. Usually the phone itself will notify you when the update becomes available via the notification bar at the top.
Again, you can check yourself by heading to Settings, finding About Phone and pressing System Update.
4. Time to download
If your phone is compatible, downloading the update is very, very simple. Either find the notification about the update and tap it or head to Settings, scroll down to find About Phone, press it and find System Update. Follow on the onscreen instructions and your phone will reboot itself with sparkly new.

KitKat and Lollypop are now released it will be available in new devices. If your device support latest version you will get notification about updates of latest version.

You can try GT Recovery for Windows which can recover deleted messages without root your phone!
no root !
Can you retrieve deleted text messages on Android? Yeah, this video will show you the full guide for Android text message recovery. Don't hesitate and recover deleted text messages from Android 4.0, 4.1, 4.2, 4.4, 5.0, 5.1 and more versions right now!
Not only can you recover SMS messages from Android backup but also can recover Android SMS messages without backup. This video is showing you how to recover deleted sms messages on Android without root your phone.
Some common situations that lost text messages you can recover from:
1. accidentally deleted texts on your android phone
2. lost text messages after Android 5.0 updated or other Android upgrade.
3. save text messages from water damaged, crashed, broken or smashed Android phone
4. Android deleted text messages randomly by itself
5. Factory restore Android phone.
And more...
Facebook Homepage:https://www.facebook.com/GT-Recovery-for-Windows-527139864132104/
Google+:https://plus.google.com/communities/109657948177651590858

Download link: http://www.gtrecovery.net/

Can you retrieve deleted text messages on Android? Yeah, this video will show you the full guide for Android text message recovery. Don't hesitate and recover deleted text messages from Android 4.0, 4.1, 4.2, 4.4, 5.0, 5.1 and more versions right now!
Not only can you recover SMS messages from Android backup but also can recover Android SMS messages without backup. This video is showing you how to recover deleted sms messages from Android.
Some common situations that lost text messages you can recover from:
1. accidentally deleted texts on your android phone
2. lost text messages after Android 5.0 updated or other Android upgrade.
3. save text messages from water damaged, crashed, broken or smashed Android phone
4. Android deleted text messages randomly by itself
5. Factory restore Android phone.
And more...

no root !
Can you retrieve deleted text messages on Android? Yeah, this video will show you the full guide for Android text message recovery. Don't hesitate and recover deleted text messages from Android 4.0, 4.1, 4.2, 4.4, 5.0, 5.1 and more versions right now!
Not only can you recover SMS messages from Android backup but also can recover Android SMS messages without backup. This video is showing you how to recover deleted sms messages on Android without root your phone.
Some common situations that lost text messages you can recover from:
1. accidentally deleted texts on your android phone
2. lost text messages after Android 5.0 updated or other Android upgrade.
3. save text messages from water damaged, crashed, broken or smashed Android phone
4. Android deleted text messages randomly by itself
5. Factory restore Android phone.
And more...
Watch this video and share it with your friends too so that they can also get their precious lost data back.

If you are trying to not receive sms text from Facebook there are two things you can do.

If you want to remove your phone FULLY from Facebook follow these steps:

1. Go to Facebook and sign in.
2. In top right, click account, then account settings.
3. Click mobile. You should see your phone number. Next to it, it should say "remove." Click this and your phone will no longer be linked to Facebook. You will not get text messages and will not be able to upload photos or status updates.

If you want to keep the ability to upload photos and set status updates then at step 3 above, instead of clicking the mobile link, click the notification link. In the SMS column, uncheck everything. You will no longer get text notifications.

Good luck
Mike!