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Yeah, you can't read that tweet as "8.1 is coming in 10 days." It's more like, "if everything that never goes exactly according to plan goes exactly according to plan, then the best case scenario is 10 days . . . or so."
I appreciate Elon giving an update, but no one should read anything more into it than it explicitly says.
I think by the time we receive all the updates to enable FADC the NVRAM will be worn out due to too many flashes and we will require a $3k upgrade to enable it.