Comment by kllrnohj
6 days ago
It is still largely the same, those downgrade protections apply to OTAs as well. Those anti-rollback don't brick the device, either. It might not boot to a working OS, but you can still get back to the bootloader to flash something newer. Unless you blindly lock the bootloader without testing if it boots first and the bootloader can't be unlocked again I guess, but that's quite a sequence of bad choices all around
It is still largely the same, those downgrade protections apply to OTAs as well.
But the Android SPL versions of OTA updates from Android vendors monotonically increase.
It might not boot to a working OS, but you can still get back to the bootloader to flash something newer. Unless you blindly lock the bootloader without testing if it boots first and the bootloader can't be unlocked again I guess,
This is false. As long as the boot loader is unlocked, many phones will boot the downgraded image fine. It stops booting it when you lock the boot loader and on many phones, you cannot unlock it again. You need to boot the OS to enable OEM unlocking again, but you cannot boot the OS because the bootloader refuses to.
The Fairphone community is full of people who though 'oh it boots, so I can lock', locked it and they were in a boot loop and had to send their phone to Fairphone to get it repaired for 60-70 Euro (I don't remember the exact price, but that is the ballpark).
There is an adb command that can fairly reliably detect whether the boot loader can be locked. But I'm not going to post it here, because people have to read the full flashing manual, plus in the past there was a bug where the anti-rollback would trigger even with a newer SPL.
At any rate, flashing is not for most people and it was much easier when there was no rollback protection. Of course, rollback protection does make phones much more secure.
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I wonder if your experience is based on Pixel or older/other Android devices that do not have rollback protection.