I have a big problem with my bricked LG

[jajskur21]

Hello guys, i have problem that is bothering me maybe a week, and i can't find any solution, so lets get to the point, my LG Optimus F60 D390N is bricked, when i turn it on it just shows boot certification verify and it stays like that, when i try to go into download mode so i can flash new kdz, it says the same **** ''entering download mode (error boot certification verify). Tried to go into recovery didn't work as well, tried to hard reset but the phone freezes on reset screen. I also tried to connect the phone with my PC but the pc wont read my phone... Maybe its not reading it because my phone can't get in download/recovery mode and it stays just at the start where lg logo appears with the error, idk how can i fix this problem (btw i had stock rom and was not rooted before). I had all drivers for LG on my pc, tried with LG Support Tool but yes the tool wont connect with the phone. Is there some way for my pc to detect the phone or force it into download mode with Android Studio ? I have the program but don't know how to use it, please if some1 knows how to deal with this problem tell me.

 

[H3aTeRzz]

Looks like you've tried it all.....only other thing I can suggest is to try a different USB port on you PC or a different PC. Short of that, you'll need to bring it in for repair, I would think.