I went back to stock by using LG Mobile Support Tool application (Repair Software section). It flashed correctly (D802TR20c) and I started to use it.
After a while I wanted to install 20f kdz version via Flashtool. I booted phone to download mode, connected to PC. It starts upgrading but fails at %4. There was nothing moved on phone screen, it's still says samethings. COM port should wrote on phone screen when flashing started but it doesn't.
I tried repair software section on LG Mobile Support Tool, It downloaded right firmware for my phone and started to upgrading but it fails at %4 too.
I tried TOT flashing, I did it before succesfully. But now, when I press start button, it stucks at READY.
Then I downgraded bootloader and download mode via AutoREC application, but I have still same problem. I tried it other computers too.
I can still boot to recovery and system without any problem. I can boot to download mode too, but there's something blocking flash progress.
What I should do?
Thanks in advance.