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When a firmware update becomes available, the Spark app will notify you. Pick the method that works for you.
OTA Update (Wi-Fi) Recommended
Wireless update through the Spark app - no cable needed.
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USB Update (Offline)
Wired update via the Spark EDGE Firmware Updater. For users without Wi-Fi, or when OTA fails.
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See also: Spark EDGE Firmware Release Notes