I am interested in stalling GrapheneOS custom ROM on a Pixel 3 phone.

Does this require that I root the phone?


No, it is neither required, nor recommended to root the device.

You will need to follow the official instructions here: https://grapheneos.org/install

It will require you to:

  1. Upgrade the stock OS (to get any firmware updates)
  2. Show dev options.
  3. Enable OEM unlocking.
  4. Actually unlock the bootloader.
  5. Install GrapheneOS via fastboot
  6. Lock the bootloader.

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