I had this issue as well he other day. Go 4 app not realizing what craft I had. Wouldn't even show what firmware was on the air raft either. I somehow fixed it by hooking up my phone with the OTG cable to the aircraft while the phone still had the Go 4 app opened and running, then reconnecting...
Definitely check on all of your prop retainer springs like Turbomania said. I had the same gripe a few months back with mine. Turns out that one spring was just barely a thou lwer than the rest. Bent it back and BOOM back in business.
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