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"CPU boot process: Initialization sequence a CPU follows upon startup, including loading firmware, running tests, and loading an operating system."

That's a bit vague.

I assume OP asked it to summarize in one sentence. I get a full and detailed list of things that happen, from POST to kernel loading.

Well, without specifying what CPU, how else? There are tons of specific answers to this question if you wanna pick up a random datasheet