MacBook EFI Firmware Update
The 2.1 version of MacBook EFI Firmware Update for Mac is available as a free download on our software library. The file size of the latest setup package available for download is 1.9 MB. This Mac download was scanned by our antivirus and was rated as safe. The software lies within System Tools, more precisely Device Assistants. This free Mac app is an intellectual property of Apple Inc.
From the developer:
The MacBook EFI Update utility will update the EFI firmware on your notebook computer. The update resolves an issue where an attached external display may occasionally incorrectly show a purple coloration. Your computer power cord must be connected and plugged into a working power source.
You may want to check out more software for Mac, such as MacBook SMC Firmware Update or Mac mini EFI Firmware Update, which might be similar to MacBook EFI Firmware Update.