Should I leave the checkbox checked or unchecked? I left it checked when I flashed it. I'll try removing the xnsub and see what happens. I sent the same screenshots to Innosilicon and they didn't offer any advice other than to send me the updated flash instructions in English instead of Chinese.
I had to uncheck the box in order for our miner to work. I left it checked the first time I flashed the unit and (like you) the miner refused to mine. I seriously hope this helps you.
I also did not use xnsub in the config.