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Apple MacOS upgrading to Monterey

The EFI boot ROM included in Monterey checks for an original Apple SSD. If one isn’t found, the installer will fail. The EFI boot ROM is required to flash the computer and is a requirement for a successful Monterey installation.

How to mitigate:

  1. Boot from an original Apple SSD.
  2. Upgrade it to Monterey, allowing it to install the needed firmware and drivers.
  3. After the SSD is upgraded, boot back into the installed SSD. You should be able to upgrade it to Monterey.