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LineageOS now officially supports the Pixel 9 series
(9to5google.com)
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No because the data is encrypted especially on Graphene OS and even on stock pixel phones data at rest is fully encrypted and pixel phones also have a onboard security chip as well. So unless you can unlock the user data it would be useless. That is why a locked bootloader is so important it is needed to ensure at rest encryption its a requirement for it.