Why Device Upgrade and Rollback Are System Engineering
The worst remote-device upgrade failure is not “the upgrade failed.” It is “the upgrade failed and the device never comes back.”
Many IoT devices are deployed in the field. Engineers cannot easily open them, flash them manually, or attach a serial console. If one OTA update corrupts the boot slot, migrates configuration irreversibly, or switches to a new system that cannot connect back to confirm success, the device may become unrecoverable remotely.
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