There is no single "ALPS 8227L" update file. Firmware must match your specific hardware configuration (e.g., 2GB RAM vs. 1GB RAM).

Do not pay for firmware online. It is available for free on XDA Developers forums or specialized car audio blogs. Search for: "8227L firmware 1024x600 free download" or check YouTube video descriptions from channels like "Joying Auto" or "Android Car Stereo Updates."