First you ask regarding AE access to iron:

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Not "It might be possible that they had access to iron"?
You're claiming as fact that "they had access to iron"?

That's a bold claim.
What do you base that on?

Now after this information is provided to you including an OK textual reference to iron your questions now are:

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I'm sorry, how did the 6th Dynasty write "iron"?

And how do we know that what we call "iron" today is what that text is referring to?

For that matter, what is the "ceiling of the sky" and how did it "open"?

When does this end?

To be fair, regarding the beads, it is possible they were imported from elsewhere, probably from Anatolia by way of Byblos or the Levant.