- Fastboot boot TWRP
- Install latest SuperSU ZIP (v2.79-SR3 at the time of writing)
Note that at this time I recommend against fastboot flashing TWRP. With the Pixel's new partition layout, the recovery files are inside the boot partition, and so is SuperSU. If you flash both, SuperSU's internal boot image backup will not be of the original boot image, but of TWRP. This means that neither the 'full unroot' option in SuperSU, nor incremental OTA update through FlashFire, will work as expected.
- Use CF-Auto-Root for Pixel (not released at the time of writing, but should be released soon)