This request appears to refer to the LG CAM6000 (often associated with LG Split Air Conditioners) and the specific PWFMZ00 Wi-Fi Module firmware.
If the web GUI is dead, but the bootloader works:
Scenario C: Manual Firmware Flashing (Advanced/Rare)
If you have tried all steps above and your CAPM-6000 still fails to boot, contact LG U+ customer service (국번없이 101). Request a firmware reflash via USB or a device exchange. Remember, as an ISP-provided router, the firmware is LG U+’s responsibility – not yours.