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Root Your Sony Xperia Z1 Running Jelly Bean 4.2.2 Build number 14.1.G.1.534. This works on Locked Bootloader as well as Unlocked Bootloader. All the images used in the tutorial are not mine , I have used images by krabappel2548 , special thanks to him and the Chinese who have made the software vRoot , which we will using to root the phone.

This tutorial is for Xperia Z1 running Jelly Bean 4.2 Build number 14.1.G.1.534.

Disclaimer : I am not responsible if you brick your phone or if u make any other damage to your phone, you have been warned.
  
So Lets Start :
1. First make sure you are running Jelly Bean 4.2.2 Build 14.1.G.1.534. Go to Settings > About to verify this.

2. Enable USB Debugging , Go to Settings > About phone and tap 7 times on Build number to enable Developer options, now Go to Settings > Developer options to enable Enable USB debugging mode.

3. Enable Unknown Sources. Go to Settings > Security and check Unknown sources.

4. Download vRoot from here - http://www.mgyun.com/vroot
Yeah it is in Chinese, so bear with it :P , download it and install this software just click next next like u install any other software :P



5. Open the vRoot (ROOT´óʦ , this will be the name of the program) and Connect your data cable to your phone and PC , you will see a green Root icon in vRoot, click on that to start the rooting process. See the below screenshot. 


6. When it is finished your phone will restart automatically and vRoot will show something like the below screenshot.


7. Congratulations your phone is now rooted . To verify see the Kinguser app , see the note below to replace it with SuperSU. 

Note :- If you want to change the Kinguser (Chinese Superuser app) to SuperSU , Download this File - LINK. Extract it somewhere , and run runme_win.bat. Kinguser will change to SuperSU.

OR

If you want to change the Kinguser (Chinese Superuser app) to SuperSU , just download SuperSU from Playstore , open it , it will ask for Root Permissions , grant it , then follow the screen instructions to update the binary. Now open SuperSU , go to Settings and click on "Install SuperSU into /system" . Your phone will reboot and Kinguser will automatically get uninstalled :)


Note : This method works on both locked and unlocked bootloader devices!!!  


If you have any problems feel free to comment.  

Source - XDA

Sony released a new update for Xperia Z1 Build 14.4.A.0.157 with some bug fixes aand here is the tutorial to root the latest firmware :D . This tutorial is only for Build 14.4.A.0.157 , will work on all models of Xperia Z1 i.e C6902, C6903, C6909, C6943 :)

To Root any older Build version of Xperia Z1 CLICK HERE

Disclaimer : I am not responsible if you brick your phone or if u make any other damage to your phone

So Lets Start :
1. First make sure you are running KitKat 4.4.4 Build 14.4.A.0.157. Go to Settings > About to verify this. The below screenshot is of C6902 but the method will work on all models of Z1 running Build 14.4.A.0.157.

2. Download and install Flashtool from here - http://www.flashtool.net/downloads.php

3. Download these three files ( See this screenshot first - http://i.imgur.com/DgoqOIA.png )

• C690X_14.4.A.0.108_KernelOnly.ftf 
• C690X_14.4.A.0.157_KernelOnly.ftf
• rootkitXperia_20140719.zip

4. Copy C690X_14.4.A.0.108_KernelOnly.ftf and  C690X_14.4.A.0.157_KernelOnly.ftf  to C:Flashtoolfirmwares

5. Run Flashtool and Flash C690X_14.4.A.0.108_KernelOnly.ftf ( See the screenshots below ) Press Volume down button and connect your phone to connect in Flash Mode.






6. Close Flashtool ( DO NOT SKIP THIS STEP ) 

7. Boot your device , and Connect Your Device to PC with USB Debugging Mode On , go to Settings > Developer Options to enable it. Also Enable Unknown Sources. Go to Settings > Security and check Unknown sources.

8. Extract rootkitXperia_20140719.zip and execute install.bat , the rooting process will start and your device will reboot ( For more instructions on this step refer this - http://www.waledacdroid.com/2014/11/how-to-root-sony-xperia-z1-c6902-c6903.html ) 

9. Now Power Off your phone and Flash the C690X_14.4.A.0.157_KernelOnly.ftf using Flashtool. Press Volume Down button and connect your phone to PC to connect in Flashmode.


10. Wait for flashing to finish , disconnect your phone from PC and boot your phone.

THATS IT YOUR PHONE IS NOW ROOTED.
 
Note : This method works on both locked and unlocked bootloader devices!!! 
 
If you have any problems feel free to comment :)  

Sony has finally released the official update of Android 5.0.2 ( Build 14.5.A.0.242 ) on Sony Xperia Z1 , but it is yet to roll out in all the countries and devices. So if you are yet to receive the update and cannot wait , here is the method to update your Xperia Z1 to Android 5.0.2 Official

This tutorial is about installing Android 5.0.2 14.5.A.0.242 on Sony Xperia Z1

This tutorial is only for Sony Xperia Z1 ( C6902, C6903, C6909, C6943 ) . Do no flash this on any other phone like Z1 compact , etc. 


Disclaimer : I am not responsible if you brick your phone or if u make any other damage to your phone  

Step 1 : First of all download this ftf File from here -  DOWNLOAD LINK  OR You can create your own FTF - Tutorial Link     
                                                      
Step 2 :

• Download Flashtool from the official website - http://www.flashtool.net/downloads.php
• Install it on your PC using onscreen instructions. It will create a folder "Flashtool" in your drive (C:Flashtool)
• Now go to CFlastooldriversflastool-drivers.exe and click on it and install it after marking/checking "Flashmode drivers and Xperia Z1 Driver"
• Restart your PC

 
Note: Make sure you have USB debugging on. If not goto setting>developer options> and check USB debugging on
 
Step 3 : Now place the downloaded ftf ( from Step 1 ) file to C:/Flashtool/firmwares/

Step 4 : Now open Flashtool from the Start Menu

Step 5 : Now click on the FLASH icon of the flashtool which is on the left side of the iconic tab(below the file option-its like a lightning sign).a window will be opened Mode Selector. Check "FlashMode" and press "ok" button.



Step 6 : Now Select the Firmware file which you had placed in C:/Flashtool/firmwares/ in Step 3


Step 7 : Now Click on the Flash Button

Step 8 : Now the flashtool will prepare files for flashing and then you will be prompted to connect phone in flashmode.


Step 9 : 
 

Feel Free to Comment if you have any doubts ;)