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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.
You definitely shouldn’t buy a Motorola now with the hope that Graphene will get added to it in the future. This could apply exclusively to pre-flashed devices, for all we know.