Once the process hits 100%, the phone will restart. The first boot after a firmware change can take 5-10 minutes. Advanced: Custom ROMs & Recovery
: This means the downloaded firmware file is corrupted. Delete it and download it again. firmware+change+update+on+lg+p970+optimus+black
Download and install the LG United Mobile Driver. Restart your PC. Connect your P970 to confirm Windows recognizes it as "LG Android Phone." Once the process hits 100%, the phone will restart
These require a custom recovery like ClockworkMod (CWM) to be installed first. Troubleshooting Common Issues Once the process hits 100%
: If the phone is unresponsive, hold the Power and Volume Down buttons for 10 seconds to force a restart.