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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.
I can’t imagine that a standard android version of the same phone would not also have the relockable boot loader. But I wouldn’t necessarily expect that feature to be on every phone series though.