Total guide Xperia ZL 6502/03 topic

1)ROOT-
NO root for 4.3 directly
Downgrade to 4.2 to get root
http://forum.xda-developers.com/show....php?t=2494134 for 6503
http://forum.xda-developers.com/show....php?t=2335306 for 6502
Flashtool
latest flashtool download
http://www.flashtool.net/download.php
Flash .ftf using flashtool
http://forum.xda-developers.com/show....php?t=2054486
root 4.2.2:
doomlords rooting toolkit
http://forum.xda-developers.com/show....php?t=2327472
install cwm
http://forum.xda-developers.com/show....php?t=2191264
to get root for 4.3 upgrade by nuts method
http://forum.xda-developers.com/show....php?t=2567266
2) Bootloader-
Backup ta partition so that you dont loose bravia engine
http://forum.xda-developers.com/show...php?p=41763438
Unlock bootloader
-get your code from here
http://unlockbootloader.sonymobile.com/
Unlock bootloader using flashtool
http://forum.xda-developers.com/show....php?t=2447319


3)Rom index:
Stock:
-4.2 stock link given above
-4.3 stock
http://forum.xda-developers.com/show....php?t=2640151 for 6503
-4.3 stock
http://forum.xda-developers.com/show....php?t=2655100
Stock based
Existenz rom(4.3)-
http://forum.xda-developers.com/show....php?t=2352237
sky dragon rom (4.2)-
http://forum.xda-developers.com/show....php?t=2407411
Custom roms-
Kitkat:
Cm11-
http://download.cyanogenmod.org/?device=odin
Codename lungo-
http://forum.xda-developers.com/show....php?t=2650316
Omni rom-
http://omni.cmxlog.com/4.4/odin/
Avatar rom-
http://forum.xda-developers.com/show....php?t=2243238
Liquidsmooth rom-
http://forum.xda-developers.com/show....php?t=2656019
Jellybean:
Illusion rom
http://forum.xda-developers.com/show....php?t=2381901
Cm10.x
http://download.cyanogenmod.org/?device=odin


4)Kernels:
stock kernel based for 4.3 .569
http://forum.xda-developers.com/show....php?t=2599619
doom kernel stock based 4.3
http://forum.xda-developers.com/show....php?t=2594479

5)Scripts
Pure performances x for any rom (actually any device)
http://forum.xda-developers.com/show....php?t=2630170
6)Gapps:

paranoid 0 day gapps art compatible
http://forum.xda-developers.com/show....php?t=2397942



Note:

all instructions are provided in repective links
all roms for 6502 will work on 6503(even stock)
installing a rom of different region wont make much difference
i m not responsible for any damage to your devices i m just sharing the links


Credits:
to all the ops in the respective thread