Sure flashed correct version? And did you apply defaults?
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Before you do anything with the new board, plug it into BF to make sure it works before soldering anything. 
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I let it auto detect from the version that was installed when i got it, so I’m pretty sure it was correct. Installed custom details each time and there is a copy on the BetaFPV site of the settings you can import too. Tried all and nothing removed the Gyro error.
Fair enuf. Did you take a backup pre re-flash and check that the same gyro type is listed?
on the cli “status” will show you the gyro used, and you probably just have to search the backup for the word gyro.
This (plus a dash of carelessness on my part) is what killed my Crossfire Nano RX. I mixed up a couple of connectors on the Mamba East F405 stack and ended up sending 5V into the RX/TX (probably). 
Still, your new one’s only got two connectors and they’re different sizes. Happy days.