method one:
1. Use the remote control to touch the screen (or close the screen with a flashlight). Click the "Set" button, press 3 down to "Advanced Settings", and press the 3 down button to "Backlight Adjustment". Brightening the screen At this point, you can easily operate the following steps: Select “Scene Mode†and exit. Then enter the factory mode and select "LG_LC420EUN_SDF1" for "Provisioning", confirm and exit, and shut down.
Method Two:
In the case of turning off the power, perform the upgrade steps 1. Prepare 4G and the following u disk in advance, format it as fat32, copy the upgrade file in (after extracting the file, place the upgrade_loader.pkg file on the USB flash drive, not the folder) And 4. Insert u disk (1 usb, 2 idle) (U disk light long), turn off the power after about 3 to 6 seconds. Wait 10 seconds to turn on the power for the second time (the u disk light is flashing) and it takes about 2 minutes to complete
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