Odd - if it's coming up with that Radio Not Found error then it'll be some kind of connection issue. It comes from this bit of code:
Radio Not Found
So basically the radio's VERSION register is returning 0 or 255, which implies that communications with the module aren't working. Is the module powered from 3.3v?
It's possible that some of those pins are used for other things on ESP8266. GPIO15 is definitely pulled low normally, and HSPI sounds like the pins could be shared with the onboard flash? I guess some others here might be able to help with that.
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