There are no form controls registered with this group yet. If you're using ngModel, you may want to check next tick (e.g. use setTimeout).

//wrap it with time out

setTimeout(() => {
       this.deviceForm.setValue({
        name: this.editedDevice.name,
        platform: this.editedDevice.platform,
        type: this.editedDevice.type,
        udid: this.editedDevice.frame
      });
    }, );