First find the target file:
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/system/host/liblaunch_sim.dylib
You need to backup liblaunch_sim.dylib (just in case). Secondly, copied to the destination ( Do not forget to backup )
/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 7.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib
And if you need it: iOS 8.1.simruntime iOS 8.2.simruntime iOS 8.3.simruntime Everything is done.
Hope this helps.
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