Xperia ZL C6502 wont update to 5.1 - Sony Xperia ZL

i tried to update my xperia ZL to the latest android version, but pc companion wont let me do it.
the problem written is
-sony update engine failure (error 0x000007d3)
-also written my device can't be update coz modified sorfware.
im don't remember if i even modified any stuf.
device details
-android version=4.4.4
-build number=10.5.1.A.0.283
-rooted
*edit-solved. relock bootloader

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[REQ] MT15 3.0.A.2.181.FTF(2.3.2) -Xperia Neo

I'm looking for Xperia 2.3.2 firmware (MT15 3.0.A.2.181.FTF) unrooted
is there anyone can provide to me.
Currently HK and Global Version support OTA only.
Currently i doing research to unroot Xperia Neo following this tutorial
http://forum.xda-developers.com/showthread.php?goto=newpost&t=1115542
Unfortunately i fail at the first time, coz the firmware in the tutorial is for Xperia Arc only.
Therefore i come out and idea to downgrade the firmware to 2.3.2 and try Gingerbreak v1.2 and update via OTA. if i success then it will be first time rooting for Xperia Neo withour unlock the bootloader.
So please help me ya

Return to 2.3.4 : |

I installed Xperia Arc S LT18 4.0.3 Rom on my Xperia Arc LT15i , now that I heared that SONY is planning to upgrade all Xperias to Android 4 next week I want to go back to 2.3.4 and update with SEUS to 4.0, but when I install .62 or any other firmware with flashtool my phone boots to 4.0 :| help please
Repair your phone with PC Companion. That will take you to 2.3.4 i think (because 4.0.3 isn't available at the moment)
Thanks I used older version of flashtool and it worked for me installed .58 firmware, thanks for quick reply.

[FTF][C6503][10.7.A.0.222][5.1.1] Customized RU

10.7.A.0.222 Customized RU now available for Sony Xperia ZL (C6503)
Build number: 10.7.A.0.222
Android version: 5.1.1
Country: Customized RU
Customization version: 1270-0692 R1E
Download links ( 1.19 GB ):
cloud.mail.ru
mega
It's funny, for xperia z (c6603) also leaves the same version.
That is 5.1.1 ??
version 5.1.1 is confirmed for the ZL and Z
C6502 5.1.1. India
Just received 5.1.1 update for C6502 INDIA
SuperSU doesn't work after update
Hi Bird40,
I updated C6503 from rooted 4.2 and SuperSU free with this FTF. After the update, SuperSU says "There is no SU binary installed and SuperSU cannot install it" and then closes. I deinstalled regular SuperSU Free and installed BETA-SuperSU-v2.49 - still got the same error. I am sure that root access is still there, because all apps that require root are working OK.
Do you have an idea why this error with SU occurs? (Can it be a conflict with another, hidden superuser? I vaguely remember I once read a post about two superusers installed side by side but can't find it...)

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