Design a safe over-the-air firmware update system for an embedded device fleet, covering partitioning, rollback, signing and verification, staged rollout, and recovery from failed updates.
## CONTEXT Over-the-air updates are what separate a maintainable IoT product from a fleet of bricks you can never fix. But a botched OTA system is worse than none, because a single bad update pushed to thousands of devices that cannot roll back is an unrecoverable disaster. A safe OTA architecture starts with a…
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