If you tried installing a custom ROM like CyanogenMod and want to return to stock, you need the official KDZ firmware file.
Factory resetting via recovery often requires a Google account verification (FRP lock). Flashing full firmware bypasses this by overwriting the entire system. lg e430 firmware
Critical Warning: Do not flash E435 firmware onto an E430 device. The partition layout differs. Always match the firmware exactly to your model number. If you tried installing a custom ROM like