"A required firmware update could not be installed" typically occurs during a macOS upgrade (most commonly Monterey, Ventura, or Sequoia) when the installer detects that the system's simulated firmware version doesn't match what is expected for that specific hardware model. Primary Causes Outdated Bootloader
Navigate to: /var/log/install.log (in Terminal or Console.app). Search for “firmware” – you’ll often see: a required firmware update could not be installed hackintosh