About video installation instructions: https://grapheneos.org/install#install "We strongly recommend following these official instructions. The official guide has a lot of collaborative effort put into covering all of the edge cases and is regularly tested by many people on each supported OS. Following these instructions to the letter without skipping, reordering or adding any steps will give you a proper GrapheneOS installation unless there's a hardware issue. We strongly recommend against following unofficial guides deviating in any way from the official instructions."