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[email protected] It will fully support using other operating systems including users making their own builds of GrapheneOS. It's part of our hardware requirements. We'll likely be able to make hardened builds of firmware and drivers which can be released in an official way for easy builds without needing to extract anything from the GrapheneOS or Motorola OS factory images.
Do you mean how you get a special boot screen implying you’re doing something sketchy?
Google signing things is not something we want. We want phones that don’t care if your OS is signed by Google, and banking apps that trust you to pick an OS.