title: Xcode device Unavailable, runtime profile not found
body: <p>In the following environment:</p>
  
  <pre><code>Xcode 8.3.2
  react-native-cli 2.0.1
  react-native: 0.44.0
  macOS Sierra 10.12.5
  </code></pre>
  
  <p>Just updated Xcode and macOS to run React Native and keep on practicing as I was some days ago... but everytime I try to run:</p>
  
  <pre><code>react-native run-ios
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>Scanning 555 folders for symlinks in /Users/juangarcia/projects/react-tests/CountDown/node_modules (6ms)
  Found Xcode project CountDown.xcodeproj
  
  Could not find iPhone 6 simulator
  </code></pre>
  
  <p>I try to see the list of devices available and I get:</p>
  
  <pre><code>~/projects/react-tests/CountDownSample » xcrun simctl list devices
  == Devices ==
  -- iOS 10.3 --
  -- tvOS 10.2 --
      Apple TV 1080p (323FA90C-0366-4B5B-AEEE-D0477C61762A) (Shutdown)
  -- watchOS 3.2 --
      Apple Watch - 38mm (F42C0C0D-325B-41DD-948D-E44B0A08B951) (Shutdown)
      Apple Watch - 42mm (75D8BAF1-27CB-47EE-9EE3-D400B962F8BC) (Shutdown)
      Apple Watch Series 2 - 38mm (64D01BD4-5C37-4885-A73A-52479D9CCF4F) (Shutdown)
      Apple Watch Series 2 - 42mm (8471C9FD-BCF3-4DDC-B386-F17E128C5EB1) (Shutdown)
  -- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-9-3 --
      iPhone 4s (1FF2D0D3-F136-43A7-8148-7B1849A7B1E3) (Shutdown) (unavailable, runtime profile not found)
      iPhone 5 (859D4D90-F1B5-4DE8-B976-6984F85CAFE3) (Shutdown) (unavailable, runtime profile not found)
      iPhone 5s (5B2AD8CD-9B3F-413C-BF16-FA96F807BB2B) (Shutdown) (unavailable, runtime profile not found)
      iPhone 6 (2573D214-4371-47A8-BFF6-3341862954E0) (Shutdown) (unavailable, runtime profile not found)
      iPhone 6 Plus (8916CD9B-4D8B-463F-8583-75A2CE4F61FD) (Shutdown) (unavailable, runtime profile not found)
      iPhone 6s (41093980-7912-4F98-9D06-981A533FAAFE) (Shutdown) (unavailable, runtime profile not found)
      iPhone 6s Plus (6A85D2AE-D867-4341-979C-FEE8308DE93E) (Shutdown) (unavailable, runtime profile not found)
      iPad 2 (BFBB5477-B6D9-48C3-B529-516D2D9105A7) (Shutdown) (unavailable, runtime profile not found)
      iPad Retina (C49B5920-F4FF-4D7F-AA74-7AE2367FF09D) (Shutdown) (unavailable, runtime profile not found)
      iPad Air (4101FC8E-D8B9-4496-AD2B-1484661C15DE) (Shutdown) (unavailable, runtime profile not found)
      iPad Air 2 (9952B05C-829F-428F-AC76-EB1F8FB55D72) (Shutdown) (unavailable, runtime profile not found)
      iPad Pro (735082E2-4470-4D9A-BAA1-BEDA8426B725) (Shutdown) (unavailable, runtime profile not found)
  -- Unavailable: com.apple.CoreSimulator.SimRuntime.tvOS-9-2 --
      Apple TV 1080p (AD48DE24-6295-4EFC-9787-A9B5D8118503) (Shutdown) (unavailable, runtime profile not found)
  -- Unavailable: com.apple.CoreSimulator.SimRuntime.watchOS-2-2 --
      Apple Watch - 38mm (C3F2A7C3-3967-4159-9B79-13CBA63E399E) (Shutdown) (unavailable, runtime profile not found)
      Apple Watch - 42mm (656005A9-7555-4872-A7FB-FB6BCB65139C) (Shutdown) (unavailable, runtime profile not found)
  </code></pre>
  
  <p>react takes by default Iphone 6 to work with, and it is not available</p>
  
  <p><strong>how can I make it available again? and why did this happen?</strong></p>