[physhster]

You can downgrade the firmware and extract the certs: https://www.dupuis.xyz/bgw210-700-root-and-certs/

However, AT&T added another layer of authentication in mid-2021 that precludes the use of third-party hardware. I don't think that part has been cracked yet.

[simfree]

You don't need the 802.1x certificate, it's never actually been needed: https://www.dslreports.com/forum/r33442912-AT-T-Fiber-Bye-by...

[RulerOf]

That's a very interesting thread. Looks like things haven't been figured out to the point of prescriptive directions, but thank you very much for bringing it to my attention. Will keep my eyes on it.