A .kdz or .dz firmware file matching your exact LG model (e.g., H93020a_00_OPEN_EU_OP_0604.kdz for LG V30). Mismatched firmware can hard-brick your device.
: Available at the LG Software & Drivers portal. lg rom up 1.1
: A stable USB cable and a computer running Windows OS are required. How to Use LG ROM Up 1.1 (General Guide) lg rom up 1.1