Clean install of a ftf is better than Flashing a Pre-Rooted zip. I flashed a Lp Pre-Rooted zip and face some problem... Specially battery drainage issue. So I cleaned installed the LP ftf. And rooted it afterwards... My battery is a beast now :)
Requirements
1: King Root http://https://userscloud.com/ke35zvpes88k
2: XZDualRecovery 2.8.15-RELEASE.installer.zip http://nut.xperia-files.com/
3: BETA-SuperSU-v2.49.zip http://https://userscloud.com/7hs0w0d9l46h
(SuperSU-v2.46 will give you binary update error) (place this zip in your internal memory/Sdcard
Steps
1: Flash your latest ftf of LP 5.0.2 via flashtool to start a clean install. IF You are already on LP, ignore step 1.
2: Install King Root Apk and Run it. Click on root. Wait until it says 100%. It should be 100%. U rooted your mobile successfully. Don't restart your mobile.
3: Place XZDualRecovery 2.8.15intsaller.zip in any folder of your PC and extract it.
4: Connect your mobile to your computer with Debugging mode enabled.
5: Open XZDualRecovery folder and Click on Install.bat. A command window will be opend. Choose/Type 2 (root with SuperUser) and pres enter. Follow the instructions... Done... XZDualRecovery is installed :)
6: Boot in to recovery and Install BETA-SuperSU-v2.49.zip. Restart your mobile... You have a working SuperSu without any binary update problem.
7: Delete KingUser App Manualy by Going into /system/app/kinguser.apk. Or u can delete it by some system app remover application. It is necessary to delete King User App because It may be cause conflict with SuperSu.
All Done.....
Requirements
1: King Root http://https://userscloud.com/ke35zvpes88k
2: XZDualRecovery 2.8.15-RELEASE.installer.zip http://nut.xperia-files.com/
3: BETA-SuperSU-v2.49.zip http://https://userscloud.com/7hs0w0d9l46h
(SuperSU-v2.46 will give you binary update error) (place this zip in your internal memory/Sdcard
Steps
1: Flash your latest ftf of LP 5.0.2 via flashtool to start a clean install. IF You are already on LP, ignore step 1.
2: Install King Root Apk and Run it. Click on root. Wait until it says 100%. It should be 100%. U rooted your mobile successfully. Don't restart your mobile.
3: Place XZDualRecovery 2.8.15intsaller.zip in any folder of your PC and extract it.
4: Connect your mobile to your computer with Debugging mode enabled.
5: Open XZDualRecovery folder and Click on Install.bat. A command window will be opend. Choose/Type 2 (root with SuperUser) and pres enter. Follow the instructions... Done... XZDualRecovery is installed :)
6: Boot in to recovery and Install BETA-SuperSU-v2.49.zip. Restart your mobile... You have a working SuperSu without any binary update problem.
7: Delete KingUser App Manualy by Going into /system/app/kinguser.apk. Or u can delete it by some system app remover application. It is necessary to delete King User App because It may be cause conflict with SuperSu.
All Done.....
xda-developers