unable to boot device due to insufficient system resources. xcode
Please see Simulator Help for information on adjusting system settings to allow more simulated devices to boot at once.
maxUserProcs: 709, runningUserProcs: 614, enforcedProcBuffer: 144
Open Terminal and run the command
sudo launchctl limit maxproc 2000 2500
xCode restricts to run more device but it has 2000 max device run capability.
sudo launchctl limit maxproc [limit for one user] [total limit]