There’s a new embedded controller firmware available:
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║ Upgrade Embedded Controller from 0x02004e12 to 0x02004e18? ║
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║ This update improves the performance and stability of the Embedded ║
║ Controller in DGX Spark ║
║ ║
║ NVIDIA_DGX_Spark must remain plugged into a power source for the duration ║
║ of the update to avoid damage. ║
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It might help with system stability.
