How to Flash Rom KDZ Method (LG Rom Flashing)

1) Download Firmware File suiteable to you

                      LG U+ ( L )

• V10c: [Download] ics
• V20e: [Download] jellybean
• V20f: [Download] jellybean
• v20h: download jellybean
• 30f : download kitkat

                    KTF ( K )

• V20g: [Download] jellybean
• v20h: download jellybean
• 30D: download kitkat

                   SK TELECOM ( S )

•  ​V20e: [Download] jellybean
• V20f: [Download] jellybean
• V20g: [Download] jellybean
• v20h: download jellybean
• 30f download kitkat

2) Download LG Drivers
3) Download LG Flash Tool 2014 tool and extract
4) Enter to Download Mode and plug USB into your PC
To enter download mode 
A) Turn off your phone
B) HOLD + and - together
C) Connect to USB (do not press Power button)
5) Run LGFlashTool2014.exe and do as following pictures :
(If you cannot run LGFlashTool2014.exe, please install Visual C++ Runtime Library) - VC_RedistInstaller.exe
Normal Flash: Flash ROM without losing any data. Only use this when you need to fix system error. Beware of boot loop when flashing ROM that differ from current ROM on your phone or MOD ROM.
CSE Flash: Choose this option when you need a fresh format. All data will be gone. It's suitable for upgrading or downgrading ROM or simply use this when you need to back to Stock. 
No need to choose desired language, it automatically change to English as a default setting.
Wait until 100% to complete !