public void notifyUpdateStatus(String status) {
   for (BootloaderListener bootloaderListener : mBootloaderListeners) {
     bootloaderListener.updateStatus(status);
   }
 }
 public void notifyUpdateError(String error) {
   for (BootloaderListener bootloaderListener : mBootloaderListeners) {
     bootloaderListener.updateError(error);
   }
 }
 public void notifyUpdateProgress(int progress, int max) {
   for (BootloaderListener bootloaderListener : mBootloaderListeners) {
     bootloaderListener.updateProgress(progress, max);
   }
 }