My phone stuck in boot loop after OTA update

PLZ Help me!

I did OTA update without unroot my phone.

after that my phone restarted then shows : update 2/2 100% complete and stuck in boot loop!

I have no boot loader

downloading mode is available

what i tried so far:

1. doing factory reset (by holding volume down + power key)

2. flash with lg flash tool and custom ROM (kdz file) in all mode like normal flash & CSE flash

all methods going well and showing complete massage, but after restart same as before(LG Logo then "update 2/2 100% complete").

plz help me