Very interesting thing. Send a review message for dayun zig 1 on dayun.company. They change your message and publish on website. I wrote

1 board is not working. I sent mail to dayun company and no reply and gave 1 star. Published message is this

" Thanks! My miners came to me, you are the best! "

This shows the objectivity of the company. You can try like me.

I have one more question. I updated to last firmware but still one board is dead. Is there any way to wake it up ?