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Reliable Firmware Update

I'd appreciate clarification of Deomid's description (https://www.embedded.com/print/4443082) of reliably updating firmware "At an early stage of the boot process, boot config with first boot set is erased and the boot process continues".

In the example, does this mean that Boot Config 1 is erased (but not newly written Image 1), to be quickly restored upon confirmation of successful boot using the new firmware ?

Also, I'd appreciate clarification of descending sequence numbers being more robust than ascending.

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