[Xperia Z Q&A, Help & Troubleshooting] EmeraldTimer:
Hei guys, for unknown reason my phone got unrooted and now i cant re root it because I always get an error message

This is my problem:

I was on stock 4.4 (.283) with root

it became unrooted

I tried to reroot with Flashtool but i always got this error output

17/045/2015 02:45:15 - INFO - <- This level is successfully initialized
17/045/2015 02:45:15 - INFO - Flashtool Version 0.9.15.0 built on 15-03-2014 23:00:00
17/045/2015 02:45:16 - INFO - Device connected with USB debugging on
17/045/2015 02:45:16 - INFO - Connected device : Sony Xperia Z
17/045/2015 02:45:17 - INFO - Installed version of busybox : BusyBox v1.22.1 bionic (2015-01-01 14:11 +0000) multi-call binary.
17/045/2015 02:45:17 - INFO - Android version : 5.0.2 / kernel version : 3.4.0-cm-ge4fca82 / Build number : LRX22G
17/045/2015 02:45:17 - INFO - Checking root access
17/045/2015 02:45:17 - INFO - Root access denied
17/045/2015 02:45:26 - INFO - Pushing C:\Flashtool\.\devices\busybox\1.20.2\busybox to /data/local/tmp/busybox
17/045/2015 02:45:27 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\su to /data/local/tmp/su
17/045/2015 02:45:27 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\Superuser.apk to /data/local/tmp/Superuser.apk
17/045/2015 02:45:28 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\chattr to /data/local/tmp/chattr
17/045/2015 02:45:28 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\install-recovery.sh to /data/local/tmp/install-recovery.sh
17/045/2015 02:45:28 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\99SuperSUDaemon to /data/local/tmp/99SuperSUDaemon
17/045/2015 02:45:28 - INFO - Pushing C:\Flashtool\custom\root\run_root_shell\install_root.sh to /data/local/tmp/
17/045/2015 02:45:28 - INFO - Pushing C:\Flashtool\custom\root\run_root_shell\run_root_shell to /data/local/tmp/
17/045/2015 02:45:29 - INFO - Pushing C:\Flashtool\custom\root\run_root_shell\device.db to /data/local/tmp/
17/045/2015 02:45:29 - INFO - Trying to apply root exploit. It can be very long. Please wait ...
17/045/2015 02:45:29 - INFO - Root failed
17/045/2015 02:45:29 - INFO - Cleaning workdir

Tried to do this but it didnt work

So i decided to install PA 5, i thought it was pre rooted but i still cant have my phone rooted

When i try to use EasyRootTool v12.4 i get this output (debugging on)

==============================================
= =
= Easy Root Tool v12 =
= Supports various Xperia devices =
= created by zxz0O0 =
= =
= http://xdaforums.com/ =
= showthread.php?p=53448680 =
= =
= Many thanks to: =
= - [NUT] =
= - geohot =
= - MohammadAG =
= - cubeundcube =
= - nhnt11 =
= - xsacha =
= =
==============================================

* daemon not running. starting it now on port 5037 *
* daemon started successfully *
=============================================
Waiting for Device, connect USB cable now...

Make sure that you authorize the connection
if you get any message on the phone
=============================================
Device found
More than one device connected.
Using device since other is emulator..

=============================================
Getting device variables
=============================================
Device model is yuga
Firmware is LRX22G

=============================================
Sending files
=============================================
99 KB/s (1593 bytes in 0.015s)
4410 KB/s (657704 bytes in 0.145s)
512 KB/s (1575 bytes in 0.003s)
912 KB/s (9496 bytes in 0.010s)
2642 KB/s (13672 bytes in 0.005s)

Copying kernel module...
2154 KB/s (34473 bytes in 0.015s)
130 KB/s (823 bytes in 0.006s)
13 KB/s (13592 bytes in 1.000s)
Kernel version is 3.4.0-cm-ge4fca82
Version does not match 3.4.0-perf-ge4322cd, needs patching...
dd: conv option disabled
Kernel module patched.
error: only position independent executables (PIE) are supported.

=============================================
Loading towelzxperia
=============================================
849 KB/s (13592 bytes in 0.015s)
4110 KB/s (197320 bytes in 0.046s)
=============================================

Waiting for towelzxperia to exploit...

error: only position independent executables (PIE) are supported.
done

Checking if device is rooted...
Error: device not rooted
Premere un tasto per continuare . . .

Can someone help me?

EDIT: I also tried to install BETA-SuperSU-v2.23.zip vis recovery but it says

"Install Failed

Finding update package...

Opening update package...

Verifying update package...

E:sginature verification failed

Installation aborted"