For some reason my iphone app cannot turn on the on-board led with pin 7, or any other pins. The app says it’s connected to my core but when I try to reconnect it to my wifi it says no cores found. When I try to use pin 7 to light up the on board led I get Unknown error: 404
404
Do you still have Tinker flashed on the core?
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Thank you. needed more characters
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Sounds like this was solved, so I changed the Title, please feel free to change it back if I did this too quickly! 
Thanks,
David