Google made this change in Android 13 so that the Pixel 6, 6 Pro, and 6a could not reinstall Android 12 to fix a security flaw. To prevent bricking your device if you flash Android 13, Google has provided advice on how to address that vulnerability without creating another issue.
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Pixel 6. What changed with the Android 13 update for
The Pixel 6 series’ old bootloader has a security flaw, and Android 13 prevents users from reinstalling the vulnerable version linked to Android 12.
However, even after successfully updating the Pixel 6 series with an Android 13 factory image—which is distinct from sideloading an OTA image—a build of Android 12 is still there on your phone. The A/B (uninterrupted) system updates for Android’s operating system, which are designed to offer redundancy, are the cause of this:
A/B system upgrades employ two slots or sets of partitions (usually slot A and slot B). The partition in the occupied slot is not accessed by the running system during normal operation, while the system operates from the occupied slot. By preserving unused slots as fallbacks, this method makes updates fault-resistant. If an error arises during or just after the update, the system can roll back to the old slot and continue operating.
“The inactive slot includes an old bootloader whose anti-rollback version has not been extended,” for instance. This mismatch can lead to issues if you flash your device and something goes wrong during the installation. Android will by default attempt to boot from an inactive slot, but this vulnerability eludes security measures. Your phone won’t turn on because Android 12 (and an outdated bootloader) are involved.
If you have flashed Android 13.
Google on Thursday afternoon offered guidance on how to stop that specific problem from occurring. Flashing Android 12 to Android 13 in the idle slot is a part of this. Although sideloading an OTA image, which updates the inactive slot, is the simplest method, instructions on how to use factory images are also available.
This method is primarily intended for individuals (i.e., tinkerers) who plan to reflash their devices with a factory or custom image (created from AOSP).
Google will, however, update Android Flash Tool—which, like Fastboot, flashes the active slot—in the upcoming days to flash the inactive slot with the Android 13 bootloader.
Having utilised Android 13 OTA
who “no action needed for now” and who sideloaded an Android 13 OTA image or accepted on-device OTA (which is Google’s recommended install option) and does not intend to flash their phones (again, aside from sideloading).
| Slot A | slot B |
| Android 12 (July Second Patch) | Android 12 (June) |
| Android 12 (July) | Android 13 (August) |
| Android 13 (September) | Android 13 (August) |
Active slot is in bold, with OTA installed in inactive slot . The business also claims that most consumers are unlikely to experience this problem due to a closed bootloader. The inactive slot will be updated through sideload or the subsequent OTA (presumably the September security patch).
Android 13 stable!#teampixel@madebygoogle #Android13 #pixel6 pic.twitter.com/gYdr0DV6yB
— Prakash Kumar Mudliyar (@paks8197) August 15, 2022
Google Pixel Owners Can Download Android 13 Starting Now
Owners of Google Pixel phones, prepare to head outside and breathe some fresh air while your phone upgrades.
Google revealed in a blog post on Monday that Pixel devices would soon start receiving Android 13 in full. People who possess Google’s exclusive devices can get in on the action early. Android 13 will eventually be released for other Android device manufacturers including Samsung, Motorola, and OnePlus.
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