[Q] Xperia Z reboots at Sony logo
i tried to update my xperia Z to 4.2.2 , in the beginning it worked but the system got unstable and started crashing , loosing signal or just turning off and not going back on until connected to the charger , so i flashed another stock rom and then it wont boot the system it would pass the sony logo and the xperia logo but reboots when the color strings start going across the screen so i tried these ways :
relocked the boot loader and uses sus and pc companion to reflash ( caused the phone to restart as soon as it turned on at the sony logo )
i tried unlocking the boot loader and flash another stock rom ( it flash but same problem )
i tried to flash boot.img from the rooting kit using fast boot and the same problem continues
now the phone turns on but it restarts at the sony logo so i guess the boot files are corrupted is there away to solve it ?
i have tried different Stock Roms to flash but nothing is working. need help