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It will automatically fall back to the alternate partition set after failing to boot a certain number of times. The failure count is one of the values retrieved via `fastboot getvar all`. It will only be bricked if neither of the partition sets is working which is very unlikely.

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It's not possible to disable OEM unlocking via the standard interface until the bootloader is already locked, so you need to be able to successfully boot in order to do that. I think it's very unlikely devices are being bricked in any reasonable flashing / development workflow.

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Once the bootloader is locked, you'll be installing updates via update packages, either via recovery or a system update app. Those get installed to the alternate partition set and if they fail to boot a single time it will automatically fall back to the previous installation.

11:29 AM · Feb 21, 2019Twitter Web Client

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Once an update boots successfully, falling back is disabled since previous versions are often not compatible with updated data and it would also be a security hazard (downgrade attacks). Recovery doesn't use userdata so it will keep working fine even if that state ends up broken.