You should have at least 2GB of free memory available.
You need the unlocked variant of one of the supported devices, not a locked carrier specific variant.
-You should verify the device already has up to date factory firmware installed - before flashing GrapheneOS, to avoid issues with OEM unlock toggle on some - devices. Factory firmware and installation instructions can be found at - - https://developers.google.com/android/images
+It's best practice to update the stock OS on the device to make sure it's running + the latest firmware before proceeding with these instructions. This avoids running + into bugs in older firmware versions. It's known that the early Pixel 2 and Pixel 2 XL + bootloader versions have weird quirks with unlocking. There aren't known issues on + other devices, but this is still a good idea. You can either do this via over-the-air + updates or sideload a full update from their + full update package page.
You need an updated copy of the fastboot tool and it needs to be
included in your PATH environment variable. You can run fastboot
--version to determine the current version. It should be at least