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Hi, everybody. And that to do if I have on all miners z9 closed all ports except 4028? 
Your miner is showing the “November” build I guess. Use the sdcard recovery steps (google it) and then install a non locked firmware of your choice, mine from my signature or someone else's, as the last step (step #10 - unnumbered on the page below).
documentation: https://support.bitmain.com/hc/en-us/articles/360006020914-Z9-V9-Z9-Mini-Control-Board-Program-Recovery
-j
THX, Everything turned out as you said.
