How to Update Android 4.4 Kit Kat in Sony Xperia P LT22i

Tools Requirements:- 
1. Charging Your battery up 80%.
2. Enable USB Debugging.
3. CWM Recovery Install in your Devices is Must Required.
Must Read:-How to Install CWM Recovery in Sony Xperia P LT22i
Must Read:- How to Root Sony Xperia P LT22i
4. Backup your all current data (link SMS,App,Contact No, every thik)
5. Download Unofficial Android 4.4 Kit Kat Rom:- Click Here to Download
6. Download Google Apps :- Click Here to Download
Instruction:- This Kit-Kat Os is works only Sony Xperia P so don't tray to other Samsung Devices.
Installation Process.  
1. Backup Up to all Data.(Current OS)
2. Use CWM to take a backup of your existing ROM. This is required, because you can use it to flash back
    your original ROM in the case of any problem to install new ROM.
3. Download Kit Kat OS Custom Rom and copy & Paste in your internal SD card.
4. Now Switch OFF your Devices.
5. Now Open your Devise in CWM recovery. Click Here to Guide
6. Then Press Volume UP Button to recovery Mode.
7. Then Go to Back up and Restore.
8. Then Press Backup your Devices. (Just wait 10 to 15 minutes)
9. After complete your back up process the press go back.
10. Then go to wipe data/factory reset.------>Yes, after complete then go back.
11. Then go to wipe cache partition.-------> Yes, after complete then go back.
12. Then go to Advanced---->Wipe Dalvik Cashe--->Yes, after complete then go back.
13. Then go to mounts and storage.-----> Format System----->Yes, after complete then go back.
14. Then go to Install Zip from sdcard.---->Choose zip from sdcard.---->Select Zip file to sdcard.
15. Select Costume Rom.---->Yes to Install this rom in your Device. see this message
16. Install from sdcard complete
17. After Again select same option Install Zip from sdcard.---->Choose zip from sdcard.---->Select GApps to sdcard. and install this apps.
18. Reboot your Devices.
19. Just wait 5 to 10 minutes to complete this process. after complete this process the go back---> Press 
      reboot system now (Wait for 15 to 20 Minutes because first time booting so don't worry)

Enjoy Your Sony Xperia SP Successfully Install Android Kit Kat.
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Note:- I am not responsible if you make any mistake and damage or any other problem your device.