I reverted this on mine. You can try to reinstall the firmware. I can`t post links so I`ll try to explain...
First you have to download
1.KDZ_FW_UPD_US (you can download it on 4shared)
2.Original firmware
3.LG USB Mobile Driver
-Make sure that your PC / Laptop uncondition on internet access / get off your WiFi
-Please extract KDZ Updater, get first to install msxml.msi
-Install LG USB Mobile Driver
-Be rid of microSD and switch on OME with tap on Volume Up = Volume down + power buttons simultaneously until the screen change in yellow and will be appearing the words “Emergency Mode”
-Connected data cable with OME. Windows will detect new hardware and install the driver above. Make sure three drivers installed as well (check Device Manager)
-Running KDZ Updater, choose 3GQCT on Type and choose DIAG on PhoneMode. Browse that Original ROM was placed. (V10x_00.kdz — x = ROM Version)
-Press the Software Update. It will take for minutes. If it failed, withdraw the battery then set again (remember that USB is on the PC)
-If it finished, click on Exit. Taking off the cable and switch on.
-The process has done.