Bumping the OTA backstop

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Aidan Wolter

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Nov 13, 2021, 4:26:59 PM11/13/21

to anno...@fuchsia.dev, pkg...@fuchsia.dev

Hello all,

I have bumped the OTA backstop using the playbook. This means you won't be able to OTA backwards across fxr/602962.

Symptom

If you try an OTA backwards across this change, the OTA will fail and you may observe a log like: "downgrades from epoch 1 to 0 are not allowed." If you need to downgrade a device across this change, consider flashing. For more details, please see RFC-0071.

Why

In order to clean up tech-debt, and simplify the UpdatePackage parsing logic, we are removing the deprecated "zedboot" option from the UpdatePackage in favor of the new "recovery". This means that update packages with the "zedboot" option can no longer be applied on newer systems.

OTAing backwards is never guaranteed to be successful, and bumping the backstop helps prevent developers from getting their device into unexpected states by preventing the update altogether.