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GrapheneOS provides extended support for end-of-life devices but we strongly discourage using our extended support releases. You can see we do that from https://grapheneos.org/releases and https://grapheneos.org/faq. We set an accurate Android security patch level field and do not downplay it with inaccurate claims about it. We do not do what other alternate operating systems by splitting out a Vendor security patch level field and claiming to provide all open source patches which is fundamentally not possible especially considering that a lot of the firmware is based on open source projects.