I could't see which hashboard detect over temp would you mind to try to run the miner with one hashboard? I mean test them one by one disconnect the two hashboard power and data cable and test again to find what hashboard is broken.
Also, try to hard reset the unit by holding the IP report button for 5 seconds or more then release then test it again and check for changes.
Thank you for your post! I had the same issue (ERROR_TEMP_TOO_HIGH) without knowing where it was coming from. This was a great suggestion, and after trying other fixes like replacing the PSU and cleaning everything, following your suggestion (one by one attachment of each hashboard) isolated the problem.
Yes, submitblock works fine. Out of curiosity, I'd like to see step-by-step how you did it. Do you have an example you could share your experience with string compilation on a spreadsheet? Looking forward to your instruction. Thanks in advance
I give the spreadsheet away for free, here, calling it the "F9 Miner" because it does one hash with each time you press F9 (calculate) in Excel:
I built it as a learning experiment for myself, but think it is worth sharing. There are no macros nor any array formulas, so you should not see any of that stuff if/when you download it. The spreadsheet self-explanatory, but if you have any questions (or find any problems) let me know here!
I think you got your answer, but you can definitely do it via the bitcoin core Console window with a submitblock command and the hex string that contains the successful (below the target) hash.