Here is where the LG E400 becomes legendary. Because LG abandoned the phone after Gingerbread (no official ICS), the XDA Developers forum took over.
The firmware scene for the L3 is arguably more famous than the stock software. Developers like Team Optimus L3 and pecanCM ported newer Android versions against all logic.
The Custom Firmware Timeline:
The most stable custom firmware for the L3 remains CyanogenMod 7.2 with the "NaA Kernel" (nobodyAlexandr). This kernel overclocked the CPU to 902 MHz and tweaked the lowmemorykiller driver, making the L3 feel like a completely different device.
[Insert actual download links to LG firmware files – e.g., from LG-firmwares.com, or your own server] Firmware LG E400 Optimus L3
If you searched "Firmware LG E400 Optimus L3" to install CyanogenMod, you need a custom recovery first.
If the above sites are down, search LG E400 stock firmware on archive.org. Many developers backed up their ROMs here. Here is where the LG E400 becomes legendary
What to avoid: