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[Q] Can't switch on LG Optimus Black P970

Hi Friends,
I am newbie to this forum. Please help me!!
I bought a new Optimus Black P970 a month back. Today i tried to upgrade my mobile using LG updater tool, it downloads the firmware and the mobile restart, after restarting.. It shows Upgrading window and suddenly
"Communication error between phone and system" Error throws.
It shows the recovery option by remove the battery and put it again and then switch on.. and restart the update. I tried but same problem exists.
I tried to hard reset, no use.
Please help me guys. I helpless.

[Q] {Q} How to remove lg f160l seccurity error screen

Hi,
I just bought my new lg optimus f160l and messed it up on the very first day...... i uninstalled some system apps and it was working all fine..........then i rebooted it and it got stuck on security error logo....
whenever i try to open it.....i see the lg logo for a sec......the shiny lg logo then.......and then the lg logo with security error written beneath it......then a total black out.
I seriously need help with my mobile. PLEASE PLEASE PLEASE! ANYONE HELP ME!

Im done!!! Security error #9 help me please !!! I tried all ways!!! Stuck at 9%

hello guys yesterday i install root and custom lg g4 rom after reboot by my self it goes on secyrity error screen authentication 9 i dont know what to do i still can enter on download mode but i dont know. i tried flash tool and lg up but they stuck at 9% please help me guys!!!!

repair possible only through service box. Visit the Service Center in your area.

LG G Stylo H636 Security error authentication #9

Hello, here is my problem, i got a lg g stylo h636, when i turn on the cellphone the lg logo apear and after that apear "security error authentication #9" when i try to go into download mode i got "secure booting error!
Cause : boot certification veriry"
and when i try to do a hard reset i got the same screen
when i plug it at the computer, it doesn't apear, the pc doesn't reconocize the cellphone at all, it doesn't appear in the computer
:crying::crying::crying::crying::crying::crying::crying::crying::crying: please someone knows how to repair this?

LG Aristo™ m210 T-Mobile stuck

New to this website
Hello need help my LG 210 is stuck it only says
YOUR DEVICE SOFTWARE CANNOT BE CHECKED FOR CURRUPTION LOCK THE BOOTLOADER.
I need to enter download mode to try to fix it but can´t .
Can someone please help me .