Where did you download the firmware?
If it is from the original website try to use this tool called EbiteMinerMiniV1.0.3.2.7z below
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http://miner.ebang.com.cn/article-8.htmlIf you can't still find the IP can you try to reset it to the factory default? Check the miner if it has a hole for the reset/IP report button hold it for 15 seconds then release.
And then try to find the IP through angry IP or use the tool above.