After having experimented with several custom ROMS over the last few days, I decided to go back to the stock ROM. I attempted to flash the stock 4.4.2 ROM using LGFlashTool. It does fine up until about 85% finished, when it reboots the phone, with the message "waiting 25 seconds for reboot". The phone reboots, then reboots a second time, and comes up in the MiniOS auto touch test, with a prompt saying "do not touch the screen". This hangs for several minutes, and the LGFlashTool eventually times out and says that the process failed. However, if you then click on OK (despite the "do not touch screen" warning), and use the combination of holding down the power button and clicking on "Normal Boot", the phone boots up and appears to be working correctly. I was then able to install the Verizon OTA update to bring the phone up to Lollipop. Am I OK at this point, or do I need to repeat the ROM-flashing process? If I need to repeat the process, how do I keep the device from hanging in the Auto Touch Test mode?
xda-developers