August 17/2022
Google officially stated on this matter and say the bootloader version used previously had a security vulnerability, as was first spotted by security researcher @flawedworld (and highlighted by Mishaal Rahman).
A warning to AOSP devs on 6th generation Pixels, ensure you flash Android 13 to both slots, because if A13 fails to boot and falls back to A12 bootloader, your phone will be perma-bricked. RIP Pixel 6.
— flawedworld (@flawedworlddev) August 16, 2022
Original Article
Recently, Google rolled out an August 2022 security patch update for the Pixel 4 series, Pixel 5 series and the Pixel 6, Pixel 6a, and Pixel 6 Pro along with the Stable Android 13 update. Google also provides you with Factory Images and OTAs to download this update on your device.
A little note for users of a Pixel 6, Pixel 6 Pro or Pixel 6a. Android 13 has just been released and is available to download for supported Pixel devices. But: the current devices, Pixel 6, Pixel 6 Pro and Pixel 6a, cannot go back to Android 12 after an update to Android 13. Certainly only a very niche problem, but one that should not go unmentioned. Google writes as follows:
Warning: The Android 13 update for the Pixel 6, Pixel 6 Pro and Pixel 6a includes a bootloader update that increases the anti-rollback version. After flashing an Android 13 build on these devices, you will not be able to flash older Android 12 builds.
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