I tried to root, then...
IMEI Unknown
IMEI SV Unknown
Baseband Unknown
NO SERVICE
NO WIFI
NO Bluetooth
Accelerometer error
HELP ME
better to flash rom again
1. Download KDZ
http://lg-phone-firmware.com/index.php?id_mod=19
LGT/LG U+(KOREA) V20d LGF160LV 891.35 MiB or
LGT/LG U+(KOREA) V20f LGF160L 878.34 MiB or
LGT/LG U+(KOREA) V20g LGF160L
2. Download Attached ZIP file
http://www.mediafire.com/download/04n6a99dp8gq5zh/unbrick_lte2.zip
1) Download the latest KDZ for your phone
check link in attached file
2) Make sure you have LG United Drivers already installed, otherwise download from below
*LGUnitedMobileDriver file in attached zip
3) Download LG KDZ Updater
KDZ_FW_UPD_EN folder in zip
4) Download the manual adb wipe batch file
wipe in attached zip
5) Put your Optimus into Download Mode by switching it off, attaching the usb cable to the phone, holding both the up and down volume buttons at the same time and lastly inserting the usb cable into the computer; wait for the drivers to finish loading if doing it for the first time.
6) run KDZ_FW_UPD.exe. Use the settings below
Type: 3GQCT
Phone Mode: CS_Emergency
KDZ file: navigate to the folder which you have saved the downloaded KDZ from the step (1)
Click Launch Software Update and wait for the flash process to finish
7) Your phone will restart itself when IParam = 90 is displayed and proceed slower until you see IParam=1 again (which signals the end of flash, you can safely exit the program then and remove the cable from the phone). If phone boots up normally, congrats, skip the steps below and proceed to use the phone as per normal