To install a custom firmware like CM9, you’ll need a custom recovery:
If your PC doesn't see the phone, try a different USB port or a Windows XP/7 environment, as modern Windows versions sometimes struggle with these older drivers. Trying to Custom ROM a 13-Year-Old Phone... (LG Optimus L3) skachat proshivku na lg e400
How to Download and Install Firmware for LG E400 Optimus L3: A Complete Guide To install a custom firmware like CM9, you’ll