If you see READY!!, then reconnect your phone.Start button, flash LG G3 BEAT D722 / D724 stock rom Now you can Run Flash Tool, check the Select Manual Mode, (1).
On the LG Flash Tool Folder, there is a file " MegaLock.dll", right-click the file and then copy and paste into LG Flash Tool installation folder, usually you can find this folder in C: LG LGFlashTool, then replace the original file.Next step is Install LG Flash Tool, but leave it dont open this program.Now, Disconnect the USB cable, wait a few seconds and then plug it in again to make sure the drivers no problem.Click Port Settings> Advanced > beside the "COM Port Number:" select "COM11",.Then you can Double-click on " LGE Mobile USB Serial Port (COM)".If driver is installed properly, you will see " LGE Mobile USB Serial Port (COM)" Now, Open Device Manager on your computer, search and click for "Ports (COM & LPT)".
LG FLASH TOOL V1 8.1 DOWNLOAD INSTALL