Kind reminder: When mining with S7, be sure that you've connected the internet properly and the internet is working well, otherwise, the boards may get burnt easily

What!? Was this mentioned on the specs page?
Can you explain why you are shipping B3 before B2?
I would not take this seriously. This message is not from Bitmain.
They would have used proper channels, and not post a poorly written post on a forum, with an unknown username, lol!
BITMAIN_YHQIN could actually be a bitmain account. I know it could look like a fake account due to the lack of posts - but unfortunately this accurately reflects the rate of customer support on this forum.